The Nub Theory

Theory Or Fact?

If you've been told it's too early to find out your babies gender at a first trimester ultrasound, take a look at the nub theory: it's highly accurate from the 12th week of gestational age.

In early pregnancy, both boys and girls have a genital tubercle which will later become a boy's penis or a girl's clitoris. We call this the nub.

So, if boys and girls both have a genital tubercle at this point, how can we tell them apart? It's the angle of the dangle:

 Boy nubs angle upward 
 Girl nubs lie down flatter

Note that it isn't a theory; it's a known biological fact, and is due to the genital tubercle's development into a penis or a clitoris.

The nub angle can be seen in a profile image of the baby.

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Disclaimer: Our website is intended for entertainment purposes only.
All though we are confident in our methods no gender is 100% accurate until birth.