Often one breast grows faster than the other. Also during puberty, your hips will get rounder, and your waist will get narrower. Some girls begin shaving their legs or under their armpits.
Girls have two ovaries.
Each one holds thousands of tiny eggs. About once a month, an ovary releases one egg. This is called ovulation. The egg moves through one of two Fallopian tubes toward the uterus. Before the egg is let go, the uterus begins building up a lining made of tissue and blood, which becomes like a nest for the egg if pregnancy happens.