Boys reaching puberty earlier, researchers unsure why

However, paediatricians are unsure why.

A study of more than 4100 boys, presented at the American Academy of Pediatrics conference in New Orleans at the weekend, found the mean age of beginning pubic hair growth and testicular enlargement was six months to two years earlier than documented in research conducted decades ago.

Paediatricians in 41 states recorded the earliest stage of puberty as occurring in Caucasian boys at 10.1 years, in African-American boys at 9.1 years and in Hispanic boys at 10.4 years. Overall African-American boys were more likely to