The first hair doesn't last. It is very short and fine.
lanugo
n.
5L, down < lana, WOOL6 a soft, downy growth; esp.,
a) the soft, downy hair covering the human fetus b) the fine hair covering most of the human body
la[nu4gi[nous 73ji n!s8 or la[nu4gi[nose# 73ji nbs#8
adj.