The earliest time we can assess the babys sex is at 12 weeks gestation/pregnancy: We can tell the sex of the baby at the 12 week scan by assessing the direction of the nub. This is something that can be identified on babies at this stage and if it points vertically then it is likely to be a boy.

What week can you tell the gender on ultrasound?

By 18 weeks, an ultrasound technician will most likely be able to identify the sex – if the baby is in a position that allows the genitals to be seen. Otherwise, you may be able to find out if you have another ultrasound later in your pregnancy.

What do they look for in a girl ultrasound?

When doing an ultrasound to determine the sex of your baby, an ultrasound technician will actually look for girl genitalia—labia and clitoris.2 When these are seen, it is often referred to as the Hamburger Sign. The clitoris situated between the labial lips looks like a hamburger between two buns, or three lines.