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en.wikipedia.org/wiki/Menstruation

Menstruation, also known as a period or monthly, is the regular discharge of blood and .... Dysmenorrhea, or severe uterine pain, is particularly common for young females (one study found that 67.2% of girls aged 13–19 have it).

always.com/en-us/tips-and-advice/your-first-period/10-common-period-questions

Period questions come into every girls mind! Puberty can be pretty crazy — you shouldn't have to worry about your first period on top of it all. Here are some ...

kidshealth.org/en/kids/five-period.html

Girls have lots of questions about periods. Here are five good ones - and the all- important answers!

kidshealth.org/en/teens/menstruation.html

Menstruation (a period) is a major stage of puberty in girls. It's one of the many physical signs that a girl is turning into a woman. Menstruation can be confusing,  ...

www.medicalnewstoday.com/articles/154699.php

Dec 12, 2016 ... A girl's periods generally begin between 8 to 16 years of age. On average, they start when a girl is about 12. Menstruation is a major stage in a ...

rubycup.com/all-about-your-period/girls-first-period

We give you the answers to your questions and explain your first period in one simple page. ... Young girl first periods thinking of using a menstrual cup.

.ask.com/youtube?q=Girls+Periods&v=yO3qwBLC1h4
Oct 24, 2016 ... Subscribe for more ▻ http://goo.gl/hZyL47 Click here for Our VLOGS - http://goo. gl/3YASrr Follow Our Instagram - http://goo.gl/FliZ56 Follow us ...
.ask.com/youtube?q=Girls+Periods&v=cjbgZwgdY7Q
Oct 19, 2015 ... View full lesson: http://ed.ted.com/lessons/why-do-women-have-periods A handful of species on Earth share a seemingly mysterious trait: a ...

youngwomenshealth.org/2011/05/25/male-pubertal-changes

May 25, 2011 ... The short answer is: Girls get periods because they have a uterus (womb). Guys don't have periods because they have don't have a uterus.

patient.info/health/periods-and-some-period-problems

May 2, 2016 ... Starting to have periods is part of growing up for girls. Periods usually start to occur around the same time as other changes happen to the body ...