Your breasts start growing when you begin puberty. Puberty is the name for the time when your body goes through changes and you begin to go from being a child to an adult. During puberty the hormone levels in your body change and this causes your breasts to develop and your menstrual periods to start. It takes three to five years from the time your breasts start growing until they reach their full size. Heredity is the most important factor in determining breast shape and size. An important

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