It is also necessary to announce how his menstruation is going on, teach him how to use sanitary napkins in detail, and help her treat this natural development happily. Six months to one year after menarche, due to various factors, menstrual period often changes, which is not morbid. As long as you keep a reasonable pace of life, you will generally turn to health day by day. If menopause lasts for more than half a year after menarche. Or each menstrual period spans 10 days, and menstrual blood is too much. Parents should take their daughters for diagnosis and treatment. For boys, their pubic hair, enlarged Adam's apple and thick voice are also puzzling. The father should announce that his son is healthy in this detail change, and there is no need to be nervous. With the development of sex, some boys will show nocturnal emission-this is often accompanied by dreaming, so it is also called "wet dream".