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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.
Spermarche âalso known as semenarche ârefers to the beginning of development of sperm in boys' testicles at puberty. It contrasts with menarche in girls.