The average age of the onset of puberty has been dropping in the last century—with some girls starting to develop breasts as early as age six or seven. These shifts in the reproductive development ...
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Tanner stages of puberty: When they happen
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 ...
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