Normal hair growth in children.

Abnormalities in the hair growth of children are common reasons for referral to a dermatologist or pediatrician. There is wide variation in the normal sequence of development of hair form and pattern in childhood and adolescence. Very occasionally, abnormalities may be a component of complex metabolic disorders. Therefore it is important to recognize the normal growth of children's hair. Most diagnoses of hair disorders may be made on clinical examination and inspection of hair shafts and roots under a light microscope.