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en.wikipedia.org/wiki/Menarche

Menarche is the first menstrual cycle, or first menstrual bleeding, in female humans. From both social and medical perspectives, it is often considered the central event of female puberty, as it signals the possibility of fertility. Girls experience menarche at different ages. .... Fewer than 10% of U.S. girls start to menstruate before 11 years of age, and ...

kidshealth.org/en/kids/menstruation.html

Although there's no one right age for a girl to get her period, ... a girl gets her period about 2 years after her breasts start to ...

www.obgyn.net/sexual-health/first-menstruation-average-age-and-physical-signs

Nov 18, 2011 ... While girls vary in the ages that they are when they start their periods and when the other signs of puberty occur, the order is fairly consistent.

teens.webmd.com/girls-puberty-10/girls-first-period

Although a girl's first period usually occurs at about age 12, some girls experience their first period much earlier. And even before she gets her first period, your ...

www.ubykotex.com/en-us/periods/puberty/what-is-the-youngest-age-that-a-girl-can-start-her-period

You know, I'm not sure what the world record is for youngest person to start her period -- but I do know there's a huge range. I know girls who started at age 8 or ...

www.nytimes.com/2012/04/01/magazine/puberty-before-age-10-a-new-normal.html

Mar 30, 2012 ... A girl who has her first period at age 10 will stop growing younger and end up shorter than a genetically identical girl who gets her first period at ...

www.bustle.com/articles/106308-what-the-age-you-got-your-first-period-says-about-you-according-to-science

Aug 27, 2015 ... But science tells us that the age at which you first got your period (or visit from ... It's a pretty major event — it signifies a girl "becoming a woman," or .... The earlier you get your period and start developing breasts and pubic ...

www.cwhn.ca/en/node/39365

In The Falling Age of Puberty in US Girls (2007), Sandra Steingraber, who is ... to establish that the average age of first menstruation in young white girls in the ...

health.usnews.com/health-news/blogs/health-advice/2009/01/26/is-it-normal-for-girls-to-have-periods-at-age-9

Jan 26, 2009 ... The average age of menarche (or the beginning of menstruation) in the ... Because this biologic occurrence has a range, some girls will start ...

www.newsweek.com/2015/02/06/puberty-comes-earlier-and-earlier-girls-301920.html

Jan 26, 2015 ... With puberty occurring at a younger age, this period begins earlier, when a girl ... Having had an earlier start to puberty, an early-maturing girl ...