Listen, this is the last time I will tell you this, and if you bring it up again you're going to learn to appreciate all that air you're breathing right now.

It is simply as I've stated before- Saiyan newborns are born with the hair they live with their entire lives. Just because human infants do not share the same traits does not mean it doesn't make sense, nor impossible. That's just how it is, and it's not my problem if you honestly cannot get that through your thick skull!