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Each person is a little different, so everyone starts and goes through puberty on his or her body's own schedule.
This is one of the reasons why some of your friends might still look like kids, whereas others look more like adults.
With all this growing and developing going on, girls will notice an increase in body fat and occasional soreness under the nipples as the breasts start to enlarge — and that's normal.
Gaining some weight is part of developing into a woman, and it's unhealthy for girls to go on a diet to try to stop this normal weight gain.
The hormones stimulate the ovaries to begin producing another hormone called estrogen. During puberty, your body will grow faster than any other time in your life, except for when you were an infant. Puberty is the name for when your body begins to develop and change.And depending on whether you're a guy or a girl, these hormones go to work on different parts of the body.For guys, these hormones travel through the blood and give the testes the signal to begin the production of testosterone and sperm.
When your body reaches a certain age, your brain releases a special hormone that starts the changes of puberty.