The genital tubercle or “nub” is fetal tissue that will develop into a penis or a clitoris as the pregnancy progresses. Nub theory says if you can get a good look at this nub on an ultrasound, you may ...

There are some expecting parents who don't want to know their baby's sex before birth. But if you're one of the many who are eager to find out before your baby arrives, the wait can feel like forever.