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Menarche (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.
1st steps are early changes in breasts and pubic hair, closely followed by peak of growth spurt and by the deveopment of breasts and pubic hair; 1st menstration (menarche) typically occurs 2 yrs after beginning of other visible changes; pregnancy can occur after menarche.