A female’s first menstrual period, known as menarche, occurs during puberty. Menstruation indicates that the body is mature enough for reproduction. About 98% of girls begin their periods by age 15.

Preparing your child for their first period—and roughly 40 more years of menstruation that follow—can feel like a big responsibility. But this milestone doesn't have to be overwhelming or awkward. In ...

The age of one's first period can predict their health in the future. (lastudio87 / Getty Images) For girls, starting their period is inevitable. But the age when a child’s period begins, called ...