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Growing stages of breasts

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There is evidence of early puberty leading to increased risk of obesity, type 2 diabetes, heart disease and cancer — particularly breast cancer. Until now, unfortunately, scientists have poorly understood the processes that make some girls develop younger than others. But new findings from our research at the University of Glasgow solve a large part of the mystery and could have important health implications as a result. It is usual for girls to develop breasts around the age of ten, though plenty start earlier or later and this is often seen as normal and harmless.
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Breast Stages of Development

Breast development , also known as mammogenesis , is a complex biological process in primates that takes place throughout a female's life. It occurs across several phases, including prenatal development , puberty , and pregnancy. At menopause , breast development ceases and the breasts atrophy. Breast development results in prominent and developed structures on the chest known as breasts in primates, which serve primarily as mammary glands. The process is mediated by an assortment of hormones and growth factors , the most important of which include estrogen , progesterone , prolactin , and growth hormone. The master regulators of breast development are the steroid hormones , estrogen and progesterone , growth hormone GH , mostly via its secretory product, insulin-like growth factor 1 IGF-1 , and prolactin.
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The Stages of Female Puberty: Hair, Boobs, and Other Signs

Professional Reference articles are designed for health professionals to use. You may find one of our health articles more useful. NICE has issued rapid update guidelines in relation to many of these. This guidance is changing frequently. See also separate Delayed Puberty and Precocious Puberty articles.
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If you have symptoms of Covid, please visit our Coronavirus Symptom Checker. If you have had Covid symptoms for more than 4 weeks OR are concerned about ongoing symptoms, please click here. For more information about Covid, the vaccine and new variants, please visit the Welsh Government and Public Health Wales websites. For general information, visit our encyclopaedia page. Puberty describes the time in life when the body matures sexually and the reproductive organs become functional.
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