Preparing your child for menstruation - Mayo Clinic - Teens in mensturation
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A period is a release of blood from a girl's uterus, out through her vagina. Most of the time, a girl gets her period about 2 years after her breasts start to develop. This discharge usually begins about 6 months to a year before a girl gets her first period. Wondering whether it's normal to have irregular periods? Get the facts about this common problem.