Gender has nothing to do with the amount of hair a baby has when it is first born .. Or for that matter anytime during a person's lifetime. Genetics determines EVERYTHING about hair colour, texture and length .. Period.
Most babies are born with no hair no matter what sex they are! When a baby does have hair when it's born, it's sex doesn't have anything to do with the length of its hair.
I wish I could sing. My voice is awful! And no, I am not just saying that. The look on my husband face the first time he heard me said it all.