Nub theory

One of the most common questions I get asked during the first prenatal visit is, “ when can we find out the sex of the baby?” My answer is dependent on what tool the expectant parents would like to use to help determine this. Your two main options are a blood test called cell-free DNA that can be done as early as 10 weeks of pregnancy, and an anatomical ultrasound, which can be used to determine fetal sex at 18 to 20 weeks. Recently, however, an alternative ultrasound method has emerged that is said to help determine fetal sex, known as the Nub Theory. So what is the Nub Theory, exactly, and is it actually reliable? Here’s the deal.

Before 14 weeks of gestation, both male and female fetuses have an anatomical body part between the legs called a genital tubercle, otherwise known as “the nub.” This genital tubercle, or nub, is what develops into the penis in male babies or the clitoris in female babies. According to the Nub Theory, specific ultrasound measurements taken between 12 and 14 weeks of pregnancy can be used to calculate the angle of the genital tubercle in relation to the fetal spine, which can determine whether the fetus is a boy or a girl. In other words, the “angle of the dangle” (yes, it’s a term circulating on the internet) can tell you if that nub will go on to develop into a penis or clitoris.

Nub Theory Results for a Boy or Girl

To put the Nub Theory into practice, an ultrasound technician would need to capture a sonogram of baby in clear profile, so the full length of their spine is visible. Next, the technician would locate the genital tubercle protruding from between baby’s legs and determine the angle between the nub and the fetal spine. If the nub angle is more than 30 degrees, baby is likely a boy. If the nub is parallel to the spine and less than 30 degrees, baby is likely a girl.

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You won’t find Nub Theory published in mainstream radiological textbooks, but it is founded in science and evidenced-based. According to a 2012 study of 1,222 patients, it was possible to reliably determine baby’s sex using the Nub Theory with an accuracy of 96.6 to 100 percent, starting at 12 weeks gestation. The bigger baby was at the time of the ultrasound (aka the farther along in pregnancy), the greater Nub Theory accuracy proved to be. When the length of the baby is too small, the sex cannot be reliably predicted. Between 12 weeks and 12 weeks 2 days, sex determination was possible 90.5 percent of the time, and the method had an accuracy rate of 96.6 percent (99.1 percent in males and 93.5 percent in females). When the angle measurements were taken past 12 weeks 2 days, feasibility increased to 97.4 percent and Nub Theory accuracy jumped to 100 percent in both male and female babies.

An earlier 2006 study showed similar results. Tested with 656 patients, Nub Theory was able to determine baby’s sex 96 percent of the time when used between 12 weeks 4 days and 12 weeks 6 days (and 97 percent of the time when used between 13 weeks and 13 weeks 6 days). It accurately identified males 99 to 100 percent of the time. For females, the method proved to be 91.5 percent accurate at 12 weeks to 12 weeks 3 days, 99 percent accurate at 12 weeks 4 days to 12 weeks 6 days, and 100 percent at 12 weeks to 12 weeks 6 days.
The research indicates that the Nub Theory has a high accuracy rate at 12 to 14 weeks of pregnancy. But of course, other aspects come into play, including the mom-to-be’s body build, the position of the baby, the ultrasound diagnostics and the experience of the ultrasonographer.

Still, Nub Theory remains just that—a theory—and is not widely used among doctors or ultrasound technicians. The most common means of fetal sex diagnosis is either by blood work as early as 10 weeks or an anatomical ultrasound mid-pregnancy.

Christian Pope, DO, FACOG, is a board-certified obstetrician and gynecologist and fellow of the American College of Obstetricians and Gynecologists in private practice at Hawthorn Medical Associates in Massachusetts. He is also a medical staff member at St. Luke’s Hospital of Southcoast Hospitals and at Women and Infants’ Hospital in Providence, Rhode Island. Additionally, he serves as a clinical instructor of obstetrics and gynecology at the Warren Alpert Brown University School of Medicine. A graduate of the Philadelphia College of Osteopathic Medicine, Pope received his obstetrics and gynecology training at the Tufts University School of Medicine, Baystate Medical Center.

Please note: The Bump and the materials and information it contains are not intended to, and do not constitute, medical or other health advice or diagnosis and should not be used as such. You should always consult with a qualified physician or health professional about your specific circumstances.

Plus, more from The Bump:


The Nub Theory

Many expecting parents are anxious to find out the sex of their unborn baby, and I frequently get asked, "How early can we find out what it is?"  If you have done any research on this, chances are you've come across comments from people in mommy blogs or Facebook groups claiming that their ultrasound tech told them it was a boy or girl as early as 11- 12- 13 weeks. Now, even though I like to think that I'm fairly good at determining what it is, I like to tell my patients that finding the sex through ultrasound is never 100% accurate... you can't really know "for sure" (I'm sure you've all heard stories about someone who thought they were having a male or female, and were shocked when the baby came out the opposite). But when it comes to finding the sex in the first trimester, it is even less accurate. In fact, it is mostly a guess based upon a theory that doesn't ALWAYS hold true for every fetus.


A baby's sex organs develop between week 7 and week 12, but a penis and clitoris remain approximately the same size until approximately week 14, which is why differentiating between the two at that stage can be tricky. But if you examine the genital tubercle in a sagital plane (at an angle similar to the one you'd need to view the profile of the face- only you would be looking at the lower half of the body instead of the top half), you can use what is known as the Nub Theory to guess male or female. This theory uses the "angle of the dangle" to guess the sex in fetuses between 11 and 14 weeks.


This theory states that, in a male fetus, the genital tubercle will be angled upwards at 30 degrees or more when compared with the spine. In a female, the genital tubercle will be parallel to the spine.


How accurate is the Nub Theory, exactly? Based upon studies, the accuracy increases with gestational age. At 11 wks, the accuracy is only approx. 68%, while at 14 weeks it is 98% accurate. That sounds pretty dang good, however, you have to keep the size of your baby and the development into consideration. While it is fun to guess the sex based upon the Nub Theory, I personally like to wait until the anatomical survey (at approximately 20 weeks) to commit to a specific sex. Having a bigger baby means having a more developed baby, which means we are more likely to view the genitals better and get a more accurate prediction.

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Nub theory: will a dating scan show the sex of my baby?

You can usually find out the sex of your baby during your 20-week anomaly scan. But if you can’t wait until then, you could give ’nub theory’ a go after your earlier dating scan. It’s the name given to a popular way of predicting your baby's sex, based on how their genitals (their ‘nub’) look on an ultrasound scan in your first trimester. It’s best treated as a bit of fun – it’s not an accurate way to tell the sex of your baby. But if you want to give it a go, you’ll need a clear photo of your baby's body in profile that shows the angle of their nub. Find out more about nub theory and how to analyse your baby’s nub.

What is my baby’s nub and what is nub theory?

The sex of your baby is fixed at conception. All embryos have a small bud or swelling (genital nub, sometimes called the ‘genital tubercle’).

If you're having a boy, testosterone starts being produced at seven weeks. Testosterone prompts the bud to grow and develop into a penis and scrotum. In a girl, the genital nub will become the clitoris and labia.

Nub theory is based on the idea that it's possible to tell which type of nub your baby has using a scan image from 12 weeks.

Why can’t I just find out the sex of my baby at my first scan?

Nub development is a gradual process, and it's a real challenge to see which way the nub is developing in your first trimester. So it's too early for your sonographer to tell you the sex of your babyat your dating scan.

It's also not part of the NHS screening programme, so your sonographer won't even be looking at your baby's sex as part of this scan.

It's best to wait until your anomaly scan, which you'll have between 18 weeks and 21 weeks. Accurately predicting your baby’s sex at this stage is far more likely.

Even then, most NHS hospitals will only disclose the sex of your baby at the anomaly scan if you ask. And some hospitals have a policy of not telling you the sex, whatever the mum's stage of pregnancy. Ask your midwife about your hospital’s policy. You should also be aware that your sonographer won’t always be able to give an accurate prediction of sex, for example, if your baby is lying in an awkward position.

If you want to pay to find out what your baby's sex is before your anomaly scan, some private clinics offer ‘gender’ ultrasound scans from 16 weeks. Some people choose a private clinic for an early scan from 10 weeks for non-invasive prenatal testing (NIPT). This is a screening test for chromosomal variations such as Down’s syndrome. But it can also reveal the sex of your baby at this early stage, as the blood test picks up fragments of fetal DNA (which carries genetic information) in your blood.

I can’t wait until my anomaly scan to find out my baby’s sex. How do I give nub theory a go?

You need a clear scan image of your baby's body in profile from your dating scan. To locate the nub, look in between where your baby's legs are forming.

Then study the ‘angle of the dangle’, basically the angle of your baby’s nub in relation to their spine:

What does a baby boy's nub look like?

If their nub is pointing up towards their head, at an angle greater than 30 degrees in relation to their spine, you may be expecting a baby boy. It's also beginning to look like a penis and scrotum.

This image was taken at 13 weeksof pregnancy.

What does a baby girl's nub look like?

If their nub is pointing down towards their bottom, at an angle less than 30 degrees in relation to their spine, you may be expecting a baby girl. This baby has a genital nub that's more horizontal to the baby's body, parallel with the spine, so she's probably a girl.

This image was also taken at 13 weeksof pregnancy.

What about a nub that isn’t clear?

This baby is between 11 weeksand 13 weeks. This nub is in a horizontal position, parallel with the baby's spine, so could be female. However, the shape looks more like a boy.

How accurate is nub theory?

Some research studies have reported quite high accuracy rates. However, it’s worth remembering that research conditions are very different to the reality of your routine scans. Research studies use trained ultrasound technicians. It's very different to you trying to work out your own baby's sex from a grainy scan photo.

These studies have found that the accuracy rate is also affected by the type and resolution of scanning equipment, your body mass index (BMI) and how far along in your pregnancy you are.

Can we find out the sex of our baby?

Midwife Tracey Owen describes how you may be able to discover the sex of your baby at your 20-week scan. See more pregnancy videos

Nub theory is just for fun, so you may also want to read about more accurate ways to find out if your baby is a boy or a girl.

Images by Martin Wink for BabyCenter


Bogers H, Rifouna MS, Koning AHJ, et al. 2017. Accuracy of fetal sex determination in the first trimester of pregnancy using 3D virtual reality ultrasound. J Clin Ultrasound 46(4):241-46. [Accessed March 2021]

Kearin M, Pollard K, Garbett I. 2014. Accuracy of sonographic fetal gender determination: predictions made by sonographers during routine obstetric ultrasound scans. Australas J Ultrasound Med 17(3):125-130. [Accessed March 2021]

Manzanares S, Benitez A, Naveiro-Fuentes M, et al. 2015. Accuracy of fetal sex determination on ultrasound examination in the first trimester of pregnancy. J Clin Ultrasound 44(5):272-7. [Accessed March 2021]

NHS. 2018. 20-week scan. NHS, Pregnancy. [Accessed March 2021]

PHE. 2018. NHS Fetal anomaly screening programme handbook. Public Health England. [Accessed March 2021]

Roberts M. 2021. NHS and private ultrasound scans during pregnancy. Which. [Accessed March 2021]

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Can Using Nub Theory Reveal If You’re Having a Boy or a Girl?

If you’re pregnant and impatiently counting down the days until your 18- to 22-week anatomy scan — the ultrasound that will give you all kinds of important info about your growing baby, including their biological sex — there’s a good chance you’ve fallen into the internet rabbit hole of sex-prediction theories.

While there, you may have come across something called “nub theory.” It gets a lot of attention for being a legit way to predict your baby’s sex much earlier than normal.

Videos and internet forums are full of people claiming to know how to analyze the early stages of a baby’s genital development to figure out whether that little appendage will turn into a boy part or a girl part.

There are even online companies offering to read your ultrasound results and “interpret” your baby’s nub for you. (For a fee, of course!)

But what, exactly, is nub theory — and is it a genuinely accurate way to predict your baby’s sex?

Nub theory, explained

Nub theory revolves around something called the genital tubercle, which forms early in pregnancy on the lower abdomen of your baby. Eventually this tubercle, or “nub,” turns into a penis in male babies and a clitoris in female babies.

The idea behind nub theory is that if you can get a really good look at this nub, you can figure out which way it will go in the coming weeks.

Specifically, prospective parents are instructed to look at what the internet calls “the angle of the dangle.” (Yes, we just said that.)

In nub theory, the angle of the nub in relation to the spinal cord tells you everything you need to know about whether your baby’s nub will soon develop into a penis or clitoris.

Timing of ultrasound 

According to proponents of nub theory, you can crack the code of your baby’s sex at a 12-week ultrasound. It’s true that between 8 and 9 weeks of gestation the genital tubercle begins to take shape, though it looks largely the same in both sexes until about 14 weeks.

Nub theory fans, however, claim that by 12 weeks the tubercle is different enough in appearance to be noted on an ultrasound.

Results that (supposedly) indicate boy

To actually apply nub theory to your baby’s ultrasound, you need to catch them in a clear profile so the length of their spine is visible horizontally. From there, you would search for the nub, or a small protrusion, in between where your baby’s legs will form.

If your baby’s nub is angled higher than 30 degrees in relation to its spine, that indicates your baby is a boy, according to nub theorists.

Now, no one is saying to whip out a protractor to figure out the specific angle here, but obviously this is where nub theory gets a little muddy.

What exactly does 30 degrees look like on an ultrasound? We don’t really know, but if you were to draw a straight line on the ultrasound along the bottom half of your baby’s spine (where their butt is, basically), you can eyeball whether the nub is pointing clearly up away from that line or not.

If it is, it’s allegedly a boy.

Accuracy of nub theory

Nub theory is a good name for this analysis, because it really is just that: a theory, without much evidence behind it. Anecdotally, some sites will tell you that the prediction is tremendously accurate.

To be clear, this isn’t a totally made-up thing. There actually are a few (older) studies suggesting that you may be able to determine a baby’s gender from an early ultrasound using the angle of the genital tubercle.

In a , researchers analyzed the tubercles of babies in 172 pregnancies, determining whether the angles were greater or less than 30 degrees. At 11 weeks, there was 70 percent accuracy in determining gender, and by 13 weeks, that number had jumped to more than 98 percent.

Similar results were found in a , with a larger sample size of 656.

However, in a larger study from 2012, the accuracy was found to be much lower, though it did increase over time as the gestational age increased. This suggests that waiting longer to determine sex leads to more accurate results.

Better ways to learn baby’s sex before the anatomy scan

Most pregnant women undergo first trimester screening that includes an ultrasound and blood tests for chromosomal abnormalities like Down syndrome and trisomy 13.

This is usually done between 11 and 14 weeks gestation and includes the same ultrasound that nub theory proponents claim can be used to predict the baby’s sex.

Typically, the prenatal blood tests involved at this stage check for protein and hormone levels that can signal fetal abnormalities. But if you’re at risk for other abnormalities, especially sex-linked disorders like hemophilia and Duchenne muscular dystrophy, your doctor may suggest including a blood test that can detect a baby’s sex.

The takeaway 

Nub theory is a fun way to make a slightly-better-than-random guess at your baby’s sex after your 12-week ultrasound. (Hey, it’s probably more accurate than peeing in a cup of salt water to see if you’re pregnant!)

But we don’t recommend committing to a gender-based nursery decor theme until you’ve had your full anatomy scan and a medical professional has confirmed your baby’s sex. Before that, nub theory is no better than a guesstimate.


Theory nub

Nub Theory: What is it and how it predicts your baby’s sex at 12 weeks

  • We earn a commission for products purchased through some links in this article.

  • The Nub Theory can help you discover your baby’s gender at the 12 week scan, all you need is your first ultrasound picture.

    Pregnancy is such an exciting – but slow – time! During that first trimester you’re excited to know as much about your baby as possible; like the gender. Usually you have to wait until your 18-22 week anatomy scan to be in with a chance of finding out, but the Nub Theory is a popular way for parents-to-be to predict their baby’s gender at just 12 weeks.

    Unlike other methods that use astrology to predict a baby’s gender or old wives tales about pregnancy to guess if you’re carrying a boy or a girl, the Nub Theory uses the 12-week ultrasound scan picture to predict the sex of your baby more accurately.

    Similar to the Ramzi Theory, the nub theory says you can tell the sex of your baby at your very first ultrasound. So it’s popular with those who can’t wait to find out if they’re having a little girl or boy.

    Nub Theory: what is it?

    The Nub Theory is all about something called the genital tubercle, or a ‘nub’. All babies have this between their legs and it develops between 11-13 weeks, turning into a penis in males and a clitoris in females.

    The idea is that, if you can get a clear view and baby isn’t doing fetal gymnastics, you can predict the sex of your baby based on the angle of the nub. According to this theory, the ‘angle of the dangle’ will indicate whether a baby is a boy or girl. It’s said that if the nub is over 30 degrees up from the spine, it’s a boy. However, if it’s under that, then it’s a girl.

    To be able to apply the Nub Theory your baby needs to be in a clear profile position, so the length of their spine is visible.

    Nub Theory 12 weeks: boy

    Image of a scan highlighting the nub of a boy

    Illustration highlighting nub theory for a little boy

    Credit: Canva

    The nub is at a much steeper angle upwards from the spine, indicating that this could be a baby boy. Now, we’re not sure what 30 degrees looks like on an ultrasound. But if you were to draw a straight line on the ultrasound along the bottom half of your baby’s spine (near their bottom) you can see whether the nub is pointing clearly up and away from that line or not.

    Nub Theory 12 weeks: girl

    image of a scan with an arrow pointing to a horizontal nub indicating a girl

    Illustration of the nub theory on a baby girl

    Credit: Canva

    If you compare the angle of your baby’s bottom/spine to the angle of the nub, and it sits horizontally in line with the spine or even points down towards it, believers would say this shows a little girl.

    Nub Theory accuracy: what the experts say

    The Nub Theory, does what it says on the tin. It’s a theory. While it may sound a little wishy-washy, there are studies to back it up. A 2016 study looked at the accuracy of the Nub or ‘Nib’ theory and the results were surprisingly accurate. The researchers found that out of 672 cases, sex determination was possible 90 percent of the time. And the baby’s gender was correctly predicted 87 percent of the time.

    “While the percentages [of those who accurately guess their baby’s gender using the Nub Theory] may seem pretty high, it’s not as easy as it sounds.” says Patricia Santiago-Munoz, M.D.  “There are a number of variables that can affect whether we can determine gender as early as 12 weeks.”

    Pregnant woman with yellow dress holding ultrasound scan for her unborn baby.

    Credit: Getty Images

    Patricia explains that you’ll have to hope for co-operation from your baby during the 12-week scan, as getting a good enough photo to use for the Nub Theory all depends on the angle of the baby:

    “First, your baby needs to be in a position for us to get a good photo. That includes not having their legs closed!” If you can get a picture of them laying down on their side, that should provide you with a good view of the nub. Patricia also explains that the quality of the ultrasound photo may also be affected by other factors too.

    “A mother’s weight also affects our ability to predict gender. The more body tissue the ultrasound waves must travel through, the fuzzier the images may be. The 2016 study found that a body mass index below 23.8 was the best cutoff value for gender prediction at 11 to 13 weeks. The odds of an accurate prediction fall for women above that number.”

    Want to give it a go yourself? Here’s an easy video on how to do it, all you need is your ultrasound photo;

    Can the Nub Theory be wrong?

    Yes, the Nub Theory can definitely be wrong. Despite the high percentage of correct gender predictions from the study in 2016.

    “There’s a chance that our prediction simply will be wrong,” says Patricia. “We tend to over-predict boys more often than girls. This can happen, for example, if the baby is developing slowly and the tubercle hasn’t begun to point up or the umbilical cord is mistaken for a penis.

    “While gender prediction is much more accurate during the 20-week ultrasound, there’s still a chance it can be wrong. I recently had a patient who was expecting a boy. She and her husband had a name picked out and had painted the nursery for a boy when they found out shortly before giving birth that they actually were having a daughter. They were shocked but took the news in stride.

    “I want to stress that the main goal of blood tests and ultrasounds during the first trimester or early second trimester is not to determine gender.”

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    “Ultrasounds are used to screen for certain conditions and check whether there is something noticeably wrong with your baby. While we understand you may be eager to learn the gender, try not to be upset if your sonographer can’t predict it.”

    In conclusion, the Nub Theory is a fun way to guess your  baby’s gender after your 12 week scan. Though, probably best to wait until a medical professional has confirmed your baby’s sex. Or until you’ve met your baby in person, before committing to any kind of colour scheme or wardrobe.


    Can Nub Theory Predict if You’re Having a Boy or a Girl?

    As soon as you share your big baby news, you’ll hear it: “So are you going to find out what you’re having?” So many people want to find out baby’s sex (whether it’s their baby or not!), it’s no wonder there’s a seemingly endless array of legitimate and not-so-legitimate ways to do just that.

    Nub theory, which relies on your sonogram image from an early pregnancy ultrasound, is one more gender prediction method to add to the mix. But before you give this one a try, learn how accurate the nub theory method of gender prediction really is.

    What is nub theory?

    Nub theory is a method some people use to predict a baby's sex. During the first part of pregnancy, both male and female fetuses have identical (and as-yet, not fully formed) genitalia known as a genital tubercle. This “nub” serves as the foundation for (you guessed it) nub theory.

    The gential tubercle looks the same in both sexes at first, but around week 7 or 8 of pregnancy, things begin to change and baby’s reproductive system begins to take shape. 

    If you’re having a boy, testosterone production begins, causing the penis to develop. Meanwhile, the absence of testosterone causes the clitoris to form in a baby girl. Even then, the penis and the clitoris will remain about the same size until about 14 weeks of pregnancy. 

    Nub theory, however, hypothesizes that you can still predict a baby’s sex by looking not at the size but the angle of the tubercle. The theory goes that the “angle of the dangle” can predict a future baby boy or baby girl. But keep in mind that unless you have a trained scientist or doctor performing this baby sex predictor test, its accuracy is questionable at best.

    When to use nub theory

    People who use nub theory say you can try it as early as 12 weeks of pregnancy. That’s later than noninvasive prenatal testing (NIPT), which can reliably detect your baby’s sex and other info as early as 9 weeks. 

    But not all pregnant moms get this genetic test, which can make nub theory sound more appealing. Otherwise, you’d typically wait until around the 20-week mark for the second trimester ultrasound  — when the reproductive organs have developed more fully — to find out the sex.

    Nub theory for boys

    To use nub theory to predict whether you’re having a boy or a girl, you’d technically need to measure the angle of the “nub” relative to your baby's spine.  If that angle is 30 degrees or more when looking at your baby from the side, you're supposedly having a boy.

    If you don't want to bother with exact measurements (and flashbacks to middle school math), you can guesstimate that an upward-pointing tubercle might (operative word: might) mean you’re pregnant with a boy.

    Nub theory for girls

    If you precisely measured the angle of the tubercle compared to your baby's spine, an angle of 10 degrees or less supposedly indicates you're having a girl, according to nub theory. Though again, it’s far from foolproof, especially when performed by someone with no scientific or medical background.

    If you prefer to simply look at the nub on an ultrasound image, check to see if it's pointed downward or is parallel with the spine, which, the theory goes, could mean you're having a girl.

    How accurate is nub theory?

    Nub theory is about 97 percent accurate, but only when performed by a trained scientist or doctor at 13 weeks or later, research indicates. But if said trained professional tries nub theory at 11 weeks of pregnancy, it’s only around 70 percent accurate, and when done at 12 weeks, it's about 85 percent accurate. Additionally, it's more common to mischaracterize a baby girl as a baby boy than the other way around.

    Again, be aware that the scientists who conducted these studies carefully measured the “angle of the dangle.” Expecting parents who aren't scientists or mathematicians may not get as precise measurements even if they do pull out a protractor. Plus, if the angle measures between 10 and 30 degrees, nub theory doesn’t provide much clarity and won’t give you a definitive answer.

    Like many other non-scientific gender predictor tests, the nub theory is just a guess and not a solid way to find out the sex of your baby.

    If you want to know for sure, ask your practitioner about genetic testing such as NIPT, which is about 95 percent accurate between weeks 7 and 12 and 99 percent accurate after week 20. Or you can wait until your 20-week anatomy scan during the second trimester for another more reliable way to learn what you’re having.

    Although it has a better track record than Chinese gender predictor charts, the ring gender testand other old wives’ tales, nub theory is not a perfect science. Go ahead and try it for fun, but if you want to know more definitively what your baby's sex will be, ask your practitioner about a more accurate way to find out.

    From the What to Expect editorial team and Heidi Murkoff, author of What to Expect When You're Expecting. What to Expect follows strict reporting guidelines and uses only credible sources, such as peer-reviewed studies, academic research institutions and highly respected health organizations. Learn how we keep our content accurate and up-to-date by reading our medical review and editorial policy.

    • What to Expect When You're Expecting, 5th edition, Heidi Murkoff.
    •, When Your Baby’s Sex Is Determined, July 2021. 
    •, What Is the Ramzi Theory and Does It Really Work?, May 2021.
    •, Noninvasive Prenatal Testing (NIPT), December 2020.
    •, Level 2 Ultrasound: The 20-Week Anatomy Scan, April 2019.
    •, Prenatal Testing During Pregnancy, March 2021.
    •, What Is the Ring Gender Test?, May 2021.
    •, 9 Scientific Signs That You're Having a Boy or a Girl, May 2021.
    • American College of Obstetricians and Gynecologists, How Your Fetus Grows During Pregnancy, August 2020.
    • KidsHealth From Nemours, Prenatal Test: Ultrasound, August 2018.
    • National Institutes of Health, National Library of Medicine, The Ultrasound Identification of Fetal Gender at the Gestational Age of 11–12 Weeks, January 2018. 
    • National Institutes of Health, National Library of Medicine, Development of the Human Penis and Clitoris, September 2018. 
    • National Institutes of Health, National Library of Medicine, Fetal Gender Assignment by First-Trimester Ultrasound, June 2006. 
    • National Institutes of Health, National Library of Medicine, Noninvasive Fetal Sex Determination Using Cell-Free Fetal DNA, August 2015.

    You will also be interested:

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    Is SneakPeek Traits Early DNA Test a paternity test?

    Who can use SneakPeek Traits Early DNA Test?

    If I purchase a second test for a different family member at a separate time, how are the tests linked together under the same main family account?

    Can I purchase additional reports for a family member?

    Why is SneakPeek Gender more accurate now?

    What if I can’t hear my baby’s heartbeat?

    Is it safe to use a Fetal Doppler?

    How does a Fetal Doppler work?

    I used last menstrual period (LMP) to calculate 7 weeks into pregnancy. Are my test results reliable?

    Can I purchase SneakPeek early and take it when I’m at 7 weeks?

    If I can’t enter a post office due to social distancing or limited hours, are there other ways to return?

    Is COVID-19 impacting SneakPeek shipping or results timelines?

    In light of COVID-19, is SneakPeek Labs still accepting return samples?

    Are SneakPeek products safe from COVID-19?

    How do I activate my SneakPeek At-Home test kit?

    Can I buy the SneakPeek test kit now and use it later?

    How do I become a SneakPeek Influencer?

    Is SneakPeek a pregnancy test?

    My blood sample was taken at a participating location. What is the status of my results?

    Is shipping free?

    Does taking progesterone or other hormones affect my results?

    Do blood thinners affect my results?

    Do you ship to APO/FPO/DPO addresses?

    I’ve seen gender predictor tests that use urine samples. How is SneakPeek different?

    What is the difference between SneakPeek Gender At-Home and SneakPeek Gender Clinical?

    Can I take the SneakPeek Test if I’m breastfeeding?

    Do hormone disorders such as PCOS affect my results?

    How is my privacy protected?

    Is the test safe?

    How quickly will I receive my refund?

    When is SneakPeek Customer Care available?

    What do I do if I have a question about my order?

    I’m having twins. Can SneakPeek determine the gender of each one?

    What is SneakPeek’s guarantee?

    I’ve previously had a boy. Will that affect my test result?

    Does a previous miscarriage affect my test results?

    How do I ensure an accurate test result?

    I can’t find my results email, what do I do?

    When will I receive my results?

    How are my results given to me?

    How will I know you received my sample?

    I don’t want my gender results to be sent to my email address. Can I have them sent to someone else?

    What email address should I provide during checkout?

    Can I track my sample?

    What is the shipping timeline?

    How long does my sample stay stable after collection? How long can it stay stable during shipping?

    What is the difference between SneakPeek Standard and SneakPeek FastTrack?

    Can I use SneakPeek if I am having a multiple-birth pregnancy?

    How is the DNA blood sample taken?

    How accurate is the SneakPeek Early Gender DNA Test?

    When can I use the SneakPeek test?

    When in my pregnancy can I take the SneakPeek Test?

    Do you have a pregnancy calculator that tells me when I can take the test?

    How does the SneakPeek Test work?

    Check out with Sezzle and split your entire order into

    4 interest-free payments over 6 weeks.

    Check out with Sezzle and split your entire order into 4 interest-free payments over 6 weeks.

    No Interest, Ever

    Plus no fees if you pay on time

    No Impact to Your

    Credit Score

    Instant Approval


    Just select Sezzle at checkout!

    Just select Sezzle

    at checkout!

    You'll go through Sezzle's 1-minute sign up process without having to leave checkout. Simply select Sezzle as your payment method when checking out.

    Subject to approval.

    Check out with Sezzle and split your entire order into

    4 interest-free payments over 6 weeks.

    Check out with Sezzle and split your entire order into 4 interest-free payments over 6 weeks.

    No Interest, Ever

    Plus no fees if you pay on time

    No Impact to Your

    Credit Score

    Instant Approval


    Just select Sezzle at checkout!

    Just select Sezzle

    at checkout!

    Subject to approval.

    With SneakPeek, shipping is always free. StandardFastTrack
    Test kit to you2-3 days1 day
    Return sample to SneakPeek2-3 days1 day
    Test result email to youDay after sample arrives at SneakPeekSame day sample arrives at SneakPeek

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