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 ...

Puberty is a gradual, whole-body transition that begins well before a girl’s first menstrual period.

For girls, starting their period is inevitable. But the age when a child’s period begins, called menarche, can tell them a little about their health later in life. Menarche that begins “anytime ...

Add Yahoo as a preferred source to see more of our stories on Google. Jessica Biel opens up about getting her first period and dealing with period shame. (Photo illustration: Yahoo News; photos: Noam ...

There is unexpectedly large variation in height growth in girls after their first period. Every second girl grows either more or less in length than the 6–8 centimeters that is considered standard.

More than 65 percent of women ages 15 to 49 in the United States use some form of birth control, and many of them are on hormonal birth control methods like the pill, patch, ring, implant, injections, ...

There is unexpectedly large variation in height growth in girls after their first period. Every second girl grows either more or less in length than the 6-8 centimeters that is considered standard.