Precocious Puberty

The parents of a 6-year-old girl bring her to a pediatrician because of breast development. Her medical history is unremarkable. The parents are of average height, and the mother reports first menstruating when she was 11 years old. On physical examination, the girl is 125 cm tall (in the 97th percentile for her age), weighs 28 kg, and has a body-mass index of 17.9 (90th percentile for her age). Her breast development is classified as Tanner stage 3, and she has Tanner stage 2 pubic hair. Review of her previous growth data indicates that she has grown 8 cm during the past year. How should her condition be evaluated and managed?