Medically reviewed by Cordelia Nwankwo, MD Key Takeaways Breast development usually starts about two years before the first period. Emotional changes and mood swings can occur just before the period.

For decades, most girls experienced their first menstrual period between the ages of 11 and 13. Today, however, doctors are seeing a noticeable shift. An increasing number of girls are entering ...

Getting your first period can come with a lot of conflicting feelings, from confusion and fear to excitement or relief. Knowing what to expect — as much as is possible — is one thing that can make ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Nancy Redd Nancy Redd is Wirecutter’s health and grooming writer. Her latest ...

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, ...

"We wanted to explore why this might be happening by looking at how environmental exposures from grandparents can influence when girls get their first period." Endocrine-disrupting chemicals (EDCs) ...