So, you have had your dating scan at around 12 weeks gestation, your friends have told you about the angle of the dangle and you found your way to our website? Congratulations, you’re in safe hands! The Nub Theory is the study of the position of the genital tubercle, affectionately known as ‘the nub’. The genital tubercle is the collection of dense tissue that will eventually become your baby’s genitalia. The nub is either the penis and scrotum, or clitoris and labia, and its angle in relation to your baby’s spine can tell us if you are growing a gorgeous girl or a beautiful boy.