Girls in the U.S. are getting their first period earlier on average than they did in the 1950s and '60s. That's according to a large new study published this past week in the journal JAMA Network Open ...

Add Yahoo as a preferred source to see more of our stories on Google. I remember the shock of getting my first period, and my mom reassuring me at the time by telling me that pretty much every woman ...

Girls in the U.S. are getting their first period earlier than in decades past. Researchers say there are multiple factors causing early puberty, including obesity and environmental pollutants. Girls ...