Girls between the ages of 9-18 to menstruation is a normal phenomenon, so 9-year-old menstruation do not have to give special treatment, just some common sense things for girls to understand, know and better protect themselves can be. 1, in the menstruation time to keep the vulva local clean, and buy cotton sanitary napkins, to do diligently change the sanitary napkin. 2, don’t drink cold drinks, and also don’t eat cold food, like Watermelon, pears, bananas, dragon fruit and other fruits should not be eaten during menstruation. 3, pay attention to warmth, such as if in the air-conditioned environment it is best to wear a good long coat, long pants, to avoid catching a cold. 4, avoid doing strenuous exercise, to reduce the likelihood of menstrual period of other complications.