Under normal circumstances, women menstruate once every 21-35 days and each period lasts about 3-7 days. As a girl has just started menstruating, ovarian function is not yet perfect, the length of the menstrual cycle and the duration of menstruation may be irregular, which is normal. With age and the number of menstruation increase ovarian function is maturing, menstruation will become regular, it is recommended that during menstruation to strengthen the care, in the life to be regular, do not stay up late, do not participate in strenuous physical activity. Do not eat cold, stimulating food, can eat more warm food, eat more beans, dairy and nuts, is conducive to the maturation of the ovarian function and the normal stability of menstruation. Pay attention to personal hygiene during menstruation, wash your hands before and after changing sanitary napkins, and change sanitary napkins frequently.