Comparing Boy and Girl Ultrasound Pictures

Can you tell the girls from the boys?

Pregnancy Ultra-Sound
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In today's world, most moms find out the sex of their baby before birth. The most common way to do that is via ultrasound, most frequently at around 18 to 20 weeks into the pregnancy. Often families wish they could know sooner, and while science is working on perfecting techniques to use as early as six weeks into pregnancy, it is not yet the standard of care.

Even though ultrasound is fairly accurate, the technician can make a mistake or be deceived by the signs that he or she sees.

The differences between boy and girl ultrasound photos are plenty.

Girl Ultrasound Photos

When looking at an ultrasound photo and trying to decide if you are looking at a girl ultrasound photo, there are a couple of things to keep in mind:

  • How far along in the pregnancy are you? An ultrasound taken a few days apart can drastically alter the accuracy, particularly in the earliest weeks and months of pregnancy.
  • What is actually seen is important. You're not necessarily having a girl simply because you don't see a penis or scrotum. Even in the absence of seeing these parts, nothing is definitive enough to confirm that your baby is a girl.
  • The machine and the experience of the person using it matter. Having someone who has a lot of practice and has a good track record is beneficial in making this call, as is having a high-quality machine.
  • The sagittal sign in the late first trimester and early second trimester for a girl is that the genital tubercle points downward.
  • In some ultrasounds, you may also be able to identify the uterus of the girl fetus and the labial lines. The clitoris and labia shown on ultrasound are sometimes known as the Hamburger sign.

Boy Ultrasound Photos

Baby boy ultrasounds do differ from those of girls. While the first point about the quality of the machine, the accuracy of the pregnancy dating, and the experience of the ultrasonographer are relevant, also consider:

  • In the later part of the first trimester and the early part of the second trimester, the sagittal sign for a boy is that the genital tubercle points upward.
  • Sometimes you can also note the direction of the flow of urine in male fetuses—upward.
  • Some ultrasounds for boys will show the descended testicles, the scrotum, and even an erect penis.

A Word From Verywell

Although you may be able to determine your baby's gender from an ultrasound, mistakes can be made. Do your best to not make large decisions until your baby is actually born. You may also experience something called gender disappointment, where you really wanted to have a specific gender but end up having the other. Many moms experience this and feel some degree of sadness or outright depression. If you experience this, seek out help. Talk to your practitioner, your partner, or a friend or family member. Remember, the most important thing is that you have a happy, healthy baby.

Sources:

Hagen-Ansert, SL. Textbook of Diagnostic Sonography - E-Book: 2-Volume Set. Seventh Edition. 2011.

Manzanares S, Benítez A, Naveiro-Fuentes M, López-Criado MS, Sánchez-Gila M. Accuracy of fetal sex determination on ultrasound examination in the first trimester of pregnancy. J Clin Ultrasound. 2016 Jun;44(5):272-7. doi: 10.1002/jcu.22320. Epub 2015 Dec 11.

Odeh M, Granin V, Kais M, Ophir E, Bornstein J. Sonographic fetal sex determination. Obstet Gynecol Surv. 2009 Jan;64(1):50-7. doi: 10.1097/OGX.0b013e318193299b.

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