Tanner stages track five milestone physical changes during puberty for both boys and girls. Early puberty in females starts before age 8, and before age 9 in males. Delayed puberty is when girls don't ...

More girls are hitting puberty at eight or earlier. Researchers are exploring the causes, the consequences and what should be done.

Responding to a study indicating that puberty can begin as early as age 6, some doctors are re-examining definitions and guidelines for treating girls who previously were considered precocious in ...

Every child goes through puberty, but not everyone experiences it at the same time. The average age that a child reaches sexual maturity differs between the genders: Girls experience puberty between 8 ...