Lanugo
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Lanugo are hairs that grow on the body to attempt to insulate it because of lack of fat. It is a type of pelage. It occurs on fetuses and it is normal for the unborn baby to consume the hair, which then contributes to the newborn baby's first faeces. Lanugo hair is usually shed and replaced by vellus hair at 36-40 weeks gestation. The presence of lanugo in newborns is a sign of premature birth.
It is also a common symptom of serious anorexia nervosa, as the body attempts to insulate itself as body fat is lost.
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