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Puberty is a sequence of events in which physical changes occur, resulting in adult physical characteristics and capacity to reproduce. These physical changes are regulated by changes in the levels of hormones that are produced by the pituitary gland—luteinizing hormone and follicle-stimulating hormone. At birth, levels of these hormones are high, but they decrease within a few months and remain low until puberty. Early in puberty, levels of luteinizing hormone and follicle-stimulating hormone increase, stimulating the production of sex hormones. The increased levels of sex hormones primarily estrogen result in physical changes, including maturation of the breasts, ovaries, uterus, and vagina.
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Physical Growth and Sexual Maturation of Adolescents

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Puberty: Adolescent Female

Puberty is the time when your child moves through a series of significant, natural and healthy changes. These physical, psychological and emotional changes signal your child is moving from childhood to adolescence. This usually happens around years for girls and around years for boys. Every child is different. Puberty can be completed in about 18 months, or it can take up to five years. This range is also completely normal. If you have a daughter, these are the main external physical changes in puberty that you can expect.
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Puberty in Girls

The teenage years are also called adolescence. During this time, teens will see the greatest amount of growth in height and weight. Adolescence is a time for growth spurts and puberty changes.
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During adolescence usually considered age 10 to the late teens or early 20s , boys and girls reach adult height and weight and undergo puberty. The timing and speed with which these changes occur vary and are affected by both heredity and environment. After age 2, growth parameters are charted using growth charts from the CDC 1. Clarification and additional information.
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