Chantal is a 5 year 2 month old child who presents with advanced development of the breasts for the past 7 months, and possible growth of pubic hair. This is associated with rapid growth. She has had intermittent "spotting" during the last two days. Apart from occasional emotional outburts (crying, "fighting" with her 9 year old sister and with her mother) she has no other problems. Chantal's Mom is 36 years old and a school teacher with height at the 50th centile. She had menses at age 13 years. Dad, 44 yrs old, is a lawyer with a height at the 50th centile. He began shaving at ~ 15-16 years of age. He has mild hypertension. The family history is negative for early puberty. The parents are non-consanguineous.