Throughout an earlier gestation (11 weeks to an early 12 weeks) your baby's nub may looked 'forked', this is how a earlier nub usually looks. A forked nub is often mistaken to be a girl, when that's not always the case, it's just an under developed nub. This can be seen in both gender's.

How do you identify a nub?

To actually apply nub theory to your baby's ultrasound, you need to catch them in a clear profile so the length of their spine is visible horizontally. From there, you would search for the nub, or a small protrusion, in between where your baby's legs will form.

What is the nub of a fetus?

Before 14 weeks of gestation, both male and female fetuses have an anatomical body part between the legs called a genital tubercle, otherwise known as “the nub.” This genital tubercle, or nub, is what develops into the penis in male babies or the clitoris in female babies.