SDI Productions/Getty Images / E+ Girls in the U.S. are getting their first menstrual period about 6 months earlier on average than they did in the 1950s and '60s. And more girls are beginning ...

The onset of menstruation or the monthly period is a significant milestone in a young girl's life. Across cultures, this momentous event is celebrated with various traditions and rituals that reflect ...

Researchers say multiple factors are likely impacting early puberty, including obesity, stress and endocrine-disrupting hormones which are widespread in the environment. (SDI Productions/Getty Images ...

Girls in the U.S. are getting their first menstrual period about 6 months earlier on average than they did in the 1950s and '60s. And more girls are beginning menstruation before the age of 9, which ...

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