(say "MEN-ar-kee") is a girl's first menstrual period. A first period usually
happens after breasts, pubic hair, and underarm hair have begun to grow. Menarche is a sign of growing up and becoming a woman. It can happen as early as about age 9 or up to age 15. The first few periods are usually light and irregular. About 2 out of 3 girls have a regular pattern
of menstrual periods within 2 years of menarche.1 During the teen years, periods may become longer and heavier. For more information, see Menarche.
In this article
WebMD Medical Reference from Healthwise
March 12, 2014
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this