baby hair

plural baby hairs

1. countabledialectalusuallyA fine, wispy strand of hair at the edge of a person's (usually a woman's) hairline.

   Medium size cornrows going back with a curl at the end of each braid. A silky, smooth, hairline, highlighted with soft black baby hairs.

   2003, Darcel Turner, Dana Dances on Paper

2. uncountableThe hair of a baby.
3. countableuncountableAny immature or fine strand of hair, or (uncountably) a collection of such hairs. (Compare baby tooth, baby fat.)

   You shed your hair, too. Old hairs fall out nearly every day, and new baby hairs grow in their places .

   1919, Eleanor Atkinson, The how and why Library

   1 more example

   He has not made the mistake of giving us a smaller horse, but shows us all the coltish attributes, the curling baby hair on the flanks, the slim gawky legs, and above all the concave face and[…]

   1931, Lida Louise Fleitmann, The Horse in Art: From Primitive Times to the Present