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Why Girls Are Entering Puberty Earlier Than Ever

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Girls entering puberty earlier than usual is a problem first spotted nearly two decades ago. But the problem is spreading to more girls, and is continuing to get worse. Trace explains why doctors think this is happening, and if parents should be concerned.

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U.S. girls keep hitting puberty earlier

“Girls are developing breasts at younger and younger ages, a new study confirms.”

Onset of Breast Development in a Longitudinal Cohort

“There is growing evidence of pubertal maturation occurring at earlier ages, with many studies based on cross-sectional observations.”

Screening for estrogen and androgen receptor activities in 200 pesticides by in vitro reporter gene assays using Chinese hamster ovary cells.

“We tested 200 pesticides, including some of their isomers and metabolites, for agonism and antagonism to two human estrogen receptor (hER) subtypes, hERalpha and hERbeta, and a human androgen receptor (hAR) by highly sensitive transactivation assays using Chinese hamster ovary cells.”

What is Causing Early Puberty In Girls?

“Elizabeth Weil writes in the New York Times, asking Puberty Before Age 10: A New ‘Normal’?, concluding that it is happening, but what are the contributing causes?”

Earlier onset of puberty in girls linked to obesity

“New research in Pediatrics shows obesity is the largest predictor of earlier onset puberty in girls, which is affecting white girls much sooner than previously reported.”

Don’t Blame the Pill for Estrogen in Drinking Water

“Contrary to popular belief, birth control pills account for less than 1 percent of the estrogens found in the nation’s drinking water supplies, scientists have concluded in an analysis of studies published on the topic.”

Why Are Girls Getting Their Periods So Young?



“I got my period when I was 11. Though the thought of a 6th grader becoming physically able to get pregnant is the stuff of most parents’ nightmares, it’s not as uncommon as you might think. The national average age for a girl to get her first period is 12, and girls can start as early as age 8. Why so young? No one would argue that an 11-year-old is emotionally capable of raising a child. Why would female biology be seemingly so far ahead of psychology when it comes to sexual maturity?”

Early puberty for girls. The new ‘normal’ and why we need to be concerned

“Many of us have heard the anecdotal evidence and may even know someone-a neighbour, a niece, a daughter: girls with breast buds and pubic hair at age 6 or 7 and first menstruation for 8-year-olds becoming the norm, not the exception.”

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