How to Tell a Baby's Gender from an Ultrasound

During pregnancy, many doctors are able to help parents with an ultrasound to determine the baby's biological gender, which is very exciting! Once you find out whether the baby will be a boy or a girl, you can throw a gender reveal party. It also gives you and your partner plenty of time to think of a name for your new child. However, it should be noted that the accuracy of the ultrasound really depends on how many weeks the woman has been pregnant. The longer means the easier it is to be sure of the baby's gender. It takes some expertise to read an ultrasound, so you’ll definitely want to have the technician or doctor give you the results. They can explain exactly what you’re looking at so you’ll be able to better understand what you're seeing.

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Asking the Technician or Doctor to Explain the Results

  1. Image titled Tell a Baby's Gender from an Ultrasound Step 1
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    Ask the technician to show you what they are looking at. If you say you want to know the gender, the technician will be happy to tell you! However, you’ll need to make it clear that you don’t want to just know the results, you want to understand them.
    • You can say something like, “Can you show me exactly what indicates the gender? Can you explain to me how you can tell? I really appreciate it!”
  2. Image titled Tell a Baby's Gender from an Ultrasound Step 2
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    Inquire if the technician can use “nub theory” at around 11-12 weeks. The gender tubercle is a body of tissue that indicates the formation of the genitals. This is commonly referred to as a “nub.” If the nub is angled upward, the gender is likely male. If the nub points straight out or down, it is more likely female.[1]
    • Sometimes the nub won’t be visible, and the technician won’t be able to see it. That doesn’t mean that anything is wrong. You'll just need to wait until your next ultrasound and hope that it will be visible then.
    • You probably won’t be able to identify the nub with an untrained eye. Ask the technician to point directly to the nub, and show you the angle.
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    Note the presence or absence of a penis at 18-20 weeks. Once you reach the 18-20 week ultrasound, it should be a lot easier to predict gender. The easiest way is to look for a penis. If you see one, there’s an excellent chance the gender is male. The absence of a penis indicates female.[2]
    • You might be able to identify a penis on your own, but it’s still a good idea to ask the technician if you’re looking at the right thing.
    • Keep in mind that sometimes another body part, like a finger, might be mistaken for a penis. The position of the fetus can sometimes make it difficult to tell for sure what is what.
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    Ask about advanced visualization to identify gender. Advances in technology have greatly improved how accurately ultrasounds can show gender. If your technician uses 2D imaging, they might be able to visualize additional parts of genitalia.[3]
    • Ask the technician to point out the vulva, clitoris, and labia, if they think the gender is female.
    • Try to identify the scrotum and testicle of a male, with the help of the technician.
    • 3D and 4D ultrasounds provide a much clearer picture of the baby at 18-20 weeks. However, they are completely optional, as they do not actually make it easier to determine the gender.
    • Although ultrasounds are safe, you should only have them when necessary. Many people get 3D or 4D ultrasounds as a "keep sake", but many doctors advise that it's better to wait to snap photos after the birth. Also, insurance might not cover the expense.[4]
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Managing Your Expectations

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    Ask about the gender at 11-12 weeks, knowing that it might not be possible to tell. You can ask if it is possible to use the nub theory at the end of the first trimester. However, the ultrasound might not show the nub. You should also know that gender predictions at this point are much less accurate than they will be later in the pregnancy.[5]
    • Ultrasounds early in the pregnancy are generally to monitor the health of the baby and check for any issues. They’re not intended to be able to reveal the gender.
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    Expect to learn the gender at a 20-week ultrasound. The second or third trimester ultrasound can more accurately predict gender. When you go for your 18-20 week ultrasound, let the technician know that you would like to know the gender. Remember to ask them to show you exactly what they are looking at.[6]
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    Accept that you have to wait for the birth to be 100% sure about the gender. Ultrasounds at 18-20 weeks might be anywhere from 88-98% accurate. That’s pretty good (it's about 10% less earlier in the pregnancy), but there is still a margin of error. It might be tough, but you’ll have to wait for the actual birth to know for certain.[7]
    • The position of the fetus or just a simple error on the part of the technician can result in predicting the wrong gender.
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Warnings

  • Check with your country's law before finding out your baby's gender. Some countries prohibit and even penalize for the same.
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  • Follow the instructions prescribed by your physician. Do not hesitate to ask questions.
    ⧼thumbs_response⧽
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References

  1. ↑ https://www.livescience.com/45582-boy-or-girl.html
  2. ↑ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3530251/
  3. ↑ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3530251/
  4. ↑ https://www.livescience.com/45582-boy-or-girl.html
  5. ↑ https://utswmed.org/medblog/gender-prediction/
  6. ↑ https://utswmed.org/medblog/gender-prediction/
  7. ↑ https://www.sciencedirect.com/science/article/pii/S0929644115001046

About This Article

wikiHow Staff
Co-authored by:
wikiHow Staff
wikiHow Staff Writer
This article was co-authored by wikiHow Staff. Our trained team of editors and researchers validate articles for accuracy and comprehensiveness. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. This article has been viewed 51,356 times.
3 votes - 67%
Co-authors: 10
Updated: March 18, 2023
Views: 51,356
Categories: Babies and Infants

Medical Disclaimer

The content of this article is not intended to be a substitute for professional medical advice, examination, diagnosis, or treatment. You should always contact your doctor or other qualified healthcare professional before starting, changing, or stopping any kind of health treatment.

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