Boys are entering puberty earlier, large study shows

BMJ 2012; 345 doi: (Published 31 October 2012) Cite this as: BMJ 2012;345:e7331
  1. Janice Hopkins Tanne
  1. 1New York

A study of 4131 boys in the United States and Canada showed that puberty is beginning six months to two years earlier than in previous studies. Researchers from the University of North Carolina at Chapel Hill and other leading medical schools and research institutions published the report online in Pediatrics.1

Recent studies of US girls have indicated that they are entering puberty about a year earlier than 40 years ago, but data on US boys entering puberty are 20 years old.

In the new study boys showed secondary sexual characteristics earlier than in previous …

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