A 4-YEAR-OLD girl had poor hair growth since birth. At birth her hair was coarse and kinky, and it fell out when she was 8 weeks old. Within months, some hair grew on her central scalp; however, she remained bald in the occipital and temporal areas for more than 1 year. By 2 years of age she had brittle hair of variable lengths throughout her scalp. Hairs were shortest in areas of greatest friction, and her mother noted that they broke easily even with gentle handling. The child required few haircuts.