Lanugo is a downy, unpigmented hair found on fetuses and sometimes on malnourished children and adults. While it is usually shed within the womb, lanugo is sometimes still present on newborn babies, particularly if they are born prematurely. Typically, lanugo on newborns is shed within days or weeks and replaced with vellus hair, which is pale, finer, and less fuzzy in appearance. Vellus hair remains on the body throughout life, and is later joined by darker, coarser terminal hair, especially after puberty.