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按照人体生长发育的一般规律,女孩子在10～11岁进入青春发育期,伴随着体内各种内分泌激素的急剧变化,身高等形态指标大幅度增长,骨骼加速钙化,性发育启动。女子性成熟的重要标志之一是子宫内膜周期性出血,即形成月经。月经首次来潮称为初潮。 女孩初潮年龄,各国各地区有所不同,其范围波动在10～16岁之间,大部分发生于13～14岁。
In accordance with the general law of human growth and development, girls in the 10 to 11 years of age into the puberty, accompanied by the rapid changes in the body of various endocrine hormones, height and other morphological indicators increased significantly accelerated bone calcification, sexual development started. One of the important signs of sexual maturity in women is the cyclical hemorrhage of the endometrium, ie, the formation of menstruation. Menstruation for the first time called the menarche. Girls age of menarche, different regions and different countries, the scope of fluctuations in the 10 to 16 years old, most occurred in 13 to 14 years old.