The nub theory is all to do with all that age-old guessing game of whether you're having a boy or girl. It is a concept that explores how a fetus's reproductive organs develop and not based around ...

“The nub and skull theory is the fastest-growing gender prediction technique simply because it is so social," said Lisa Lum, a gender expert at parenting website Channel Mum, which commissioned ...

Parents-to-be are asking strangers to guess their baby’s sex by posting scan pictures online, in a wacky new craze sweeping the internet.

Nub theory is an unproven method for determining your baby's sex before the anatomy scan. We'll tell you how it works. ... Can Using Skull Theory Reveal If You’re Having a Boy or a Girl?

The nub theory is based on predicting a child's gender at just 12 weeks Credit: Getty What is nub theory? The nub theory is also known as the angle of the dangle.

One of the fastest growing scan-analysis trends includes the nub theory—this method uses the 12-week photo to see what angle the nub (a small lump where the genitals form) is pointing.

The nub theory is based on predicting a child's gender at just 12 weeks Credit: Getty What is nub theory? The nub theory is also known as the angle of the dangle.