It is normal for a woman to have her first menstrual period at the age of 11. The first menstrual period at the age of 11 is normal, which means that the uterus is mature and has the ability to conceive. For women who have their first menstrual period earlier, their height development will be affected. Clinical data shows that women who have their first menstrual period earlier than those who have their first menstrual period later will have shorter height on average. It does not mean that women after menstruation will not develop in height, but the development space will be limited, after menstruation, women’s height development will be within 7 cm, if the menstruation is normal, do not get cold during menstruation, do not exercise strenuously.