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A 2006 study in Denmark found that puberty, as evidenced by breast development, started at an average age of 9 years and 10 months, a year earlier than when a similar study was done in 1991. Scientists believe the phenomenon could be linked to obesity or exposure to chemicals in the food chain, and is putting females at greater long-term risk ...
Another study, which was published in 2024, found that the average age that girls had their first periods decreased from 12.5 years old in 1950 to 1969 to 11.9 years old in 2000 to 2005.
[20] [21] Puberty which starts earlier than usual is known as precocious puberty, and puberty which starts later than usual is known as delayed puberty. Notable among the morphologic changes in size, shape, composition, and functioning of the pubertal body, is the development of secondary sex characteristics , the "filling in" of the child's ...
The average age of puberty’s onset — ranging from ages 8 to 13 for girls in the U.S. — has been dropping by about three months every decade over the last 40 years, according to a 2020 ...
Puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity. The average age of onset of puberty is 10–11 for girls and 11–12 for boys.
Doctors explain why it’s important for girls to learn more about reproductive health. ... She adds that girls who have not yet gone through puberty will typically benefit from seeing a pediatric ...
Experts say that lessons on puberty in school aren't comprehensive enough and often happen too late — after development has already started for many. Why puberty education in the U.S. starts too ...
Early puberty also puts girls at a higher risk for teasing or bullying, mental health disorders and short stature as adults. [ 19 ] [ 39 ] [ 56 ] Girls as young as 8 are increasingly starting to menstruate , develop breasts and grow pubic and underarm hair; these "biological milestones" typically occurred only at 13 or older in the past.