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月经第一次来潮,称为初期,根据全国各地的调查资料,我国少女的平均初潮年龄在13-16岁之间。由儿童少年向成年过渡的阶段,称为青春期。按照生理发育特点,青春期分为初期、中期和后期。初期以体格发育、身高突增为主;中期以第二性征发育为主,同时出现月经(男孩则有遗精);后期以生殖系统完全成熟为标志。世界卫生组织于1965年将青春期定为10-20岁,女孩的青春中期为13-16岁。
Menstruation for the first time, known as the early, according to survey data throughout the country, the average age of girls in China aged between 13-16 years. The transition from childhood to adulthood is called adolescence. According to the characteristics of physiological development, adolescence is divided into early, middle and late. Early physical development, sudden height-based; secondary sexual development in the middle of the main, at the same time there is menstruation (boys have nocturnal emission); late to full reproductive system as a marker. In 1965, WHO defined adolescence as 10-20 years and girls as middle age as 13-16 years.