Girls have been getting their periods earlier and earlier for more than half a century. And as early onset increased, it has taken longer and longer for menstrual cycles to become regular. Both of ...

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.

A new study finds that US girls are experiencing their first periods earlier, with factors such as improved nutrition, increased BMI, and environmental exposures potentially driving this trend.

A recent study indicates that girls of color, particularly Black girls, are beginning their menstrual cycles at younger ages than their peers. While the exact reasons for this phenomenon remain ...

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 ...