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:References

1. http://www.takepart.com/article/2015/05/01/teen-boy-grow-up-girls-periods-arent-gross
2. ↑http://kidshealth.org/en/parents/talk-about-menstruation.html#
3. ↑http://www.aboutkidshealth.ca/En/HealthAZ/FamilyandPeerRelations/Sexuality/Pages/Sex-Education-Age-Appropriate-For-Children-what-they-should-learn-and-when.aspx
4. ↑http://www.med-health.net/What-Is-The-Function-Of-The-Uterus.html
5. ↑http://kidshealth.org/en/parents/talk-about-menstruation.html#
6. ↑http://www.aboutkidshealth.ca/en/resourcecentres/pregnancybabies/preparingforpregnancy/pages/reproduction.aspx
7. ↑http://kidshealth.org/en/parents/talk-about-menstruation.html#
8. ↑http://kidshealth.org/en/parents/talk-about-menstruation.html#
9. ↑http://www.aboutkidshealth.ca/En/HealthAZ/FamilyandPeerRelations/Sexuality/Pages/Sex-Education-Age-Appropriate-For-Children-what-they-should-learn-and-when.aspx

10. ↑http://kidshealth.org/en/parents/talk-about-menstruation.html#
11. ↑http://parents.berkeley.edu/advice/health/menses_explain.html