Beginning menstruation, often called getting your period, is a normal part of puberty for girls. Your period happens around once a month because changes from puberty signal your brain to release new chemicals, called hormones, into your body.
Beginning menstruation, often called getting your period, is a normal part of puberty for girls. Your period happens around once a month because changes from puberty signal your brain to release new chemicals, called hormones, into your body.