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U.S. girls are entering puberty at a younger age than in the past. More than 10 percent of white 7-year-old girls have breast changes that signal the start of puberty, according to a study conducted in the mid-2000s. This is up from just 5 percent in the early 1990s.
The average age of a girl's first period also declined, from an average of 14 or 15 years in the past to about 12 years today.