How to tell gender on ultrasounds

Written by jennifer magnesi
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How to tell gender on ultrasounds
A male foetus will show a protrusion between the legs. (Thinkstock/Comstock/Getty Images)

Having regular ultrasounds is a typical part of any pregnancy to ensure the health and development of your unborn baby. One of the most exciting moments in a pregnancy is finding out the baby's gender with an ultrasound at about 18 to 20 weeks along. At this point in your pregnancy, the ultrasound technician may find sex organs which prove the foetus to be a male or female. There are different things the technician will look for to prove the gender of the foetus.

Skill level:
Moderately Challenging


  1. 1

    Wait until you are at least 18 weeks pregnant. While it may be possible to see the sex organs of your unborn baby before this time, most gender ultrasounds are done between 18 and 20 weeks.

  2. 2

    Look for three lines in between the legs of the foetus. Female foetuses will show three white lines between their legs, which show the presence of a vagina and vulva.

  3. 3

    View the foetus from the bottom and find two ovals with a smaller protrusion between them for indication of a male foetus. If viewed from the side, a male foetus might be determined if his penis is erect during the time of the ultrasound.

  4. 4

    Repeat the ultrasound at a later date if the result was inconclusive. Even when you wait until the recommended time to have the gender ultrasound, the baby might not be in a position where you can see between its legs. Should this happen, schedule another ultrasound appointment for a week or so later.

Tips and warnings

  • Advise the ultrasound technician ahead of time if you do not want to see the gender just yet. The technician will then tell you to turn your head if she sees evidence of a male or female sex organ and keep the information to herself.

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