The lanugal hair (or lanugo) is the first hair to be produced by the fetal hair follicles. It is very fine, soft and usually is unpigmented.
The postnatal hair that succeeds the lanugal hair is conventionally divided into vellus and terminal hair. The vellus resembles the lanugal hair in that it is short, soft and usually unpigmented. The terminal hair is longer, coarser and usually pigmented. There are intermediate types of hair. Any given follicle can change the type of hair it is making.
"Lanugo" is the Latin word for down, like the fine small hairs of plants.