Interesting question--basically, I don't know. Scalp hair in
newbornsNewborn jaundice often falls out and regrows later. Some babies are born with lanugo hairs all over--these are usually fine and pale, but can be dark and coarse. These fall out soon after birth. I can't recall ever seeing a baby with a permanent mustache, though. I think you'll have to wait and see, but permanence seems unlikely.
Best.
Dr. Rockoff