A.B.
This is a fiction based on a fact. What it is is that babies are born, and continue to grow, very fine hair. When they're about a year old something changes and they generally start to grow a thicker hair strand. So if you buzz a one year olds head, it appears that it made them grow thicker hair. I buzz my kids hair at about a year, even my girls, to get rid of that baby hair because it tangles so easy and to even it out because the bald spot they get on the back of their head usually has started to fill in by then.