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Puberty is the process of physical changes through which a child 's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads : the ovaries in a girl, the testes in a boy. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones , muscle , blood , skin , hair , breasts , and sex organs. Physical growth —height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed. Before puberty, the external sex organs, known as primary sexual characteristics , are sex characteristics that distinguish boys and girls. Puberty leads to sexual dimorphism through the development of the secondary sex characteristics , which further distinguish the sexes.
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When Is Puberty too Early?

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Puberty - Wikipedia

Age of puberty onset is considered to be of general public health relevance. A downward secular trend in age of puberty onset has now been repeatedly reported in both developed 1 and developing countries 2. Early puberty onset has been suggested to be a risk factor for a series of diseases in later life, including hormone-related cancer, type 2 diabetes mellitus, metabolic syndrome, cardiovascular disease and all-cause mortality. In china, the age of puberty onset among children has changed 2 — 5 over the last two decades. The trends of puberty onset were characterized by: 1 The puberty timing has been occurring earlier in both genders. In boys, the spermarcheal age was shift to an earlier date from
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The Trends of Puberty Onset among Chinese Children

Though that's provided if your child has already reached the age for puberty. When the girl first underwent her growth spurt, her mother was delighted by her development, therefore paid little heed to her unnatural growth. It wasn't until she was giving her daughter a shower that she realised Dandan had developed breasts.
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DENVER — A majority of girls start puberty before age 10 years, according to researchers for a longitudinal study who found young ages for onset of breast and pubic hair development. Louise C. Greenspan said at the annual meeting of the Pediatric Academic Societies, where she presented data for the first 5 years.
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