It isn't just your body changing; your brain is rewiring itself. You may feel more intense emotions, mood swings, or a new desire for independence and privacy. Sexual Education and Health
Girls also begin menstruation, or periods. A period is bleeding from the uterus that happens about once a month after ovulation begins.
00:02:20,001 --> 00:02:25,000 Breast development (thelarche) usually starts between ages 8 and 13.