Generally, a girl's menstruation lasts for 3-5 days, and when she comes to menstruation for the first time, she is between 1 3 years old and 15 years old. Generally, when girls come to menstruation, they will have menstrual disorders, and sometimes they will not come to menstruation for several months. This is a normal phenomenon. What should girls who have just come to menstruation pay attention to? Is it normal for girls to have irregular menstruation for the second time? How often does a girl's menstruation come once every few days?

Most of the girls with irregular second menarche are between12 and15 years old, with an average of 14 years old. The morning and evening of menarche is influenced by climatic conditions and health conditions. In colder regions, the age of menarche can be delayed to 15- 17 years; Girls who grow up in warmer regions can have their period at the age of 1 1- 12.

The function of ovary in adolescence is still unstable, and the menstrual cycle is irregular. After menarche, it is often several months, half a year or even longer before menstruation comes again, and then it gradually approaches once every 28-30 days. Regular menstrual cycle, the interval between two menses is generally not less than 20 days, nor more than 45 days. Everyone has their own certain rules in this range. The duration of normal menstruation is 2-7 days, mostly 3-5 days.

How to maintain the body after menarche for girls: First, pay attention to cleanliness. Keep the vulva clean during menstruation and wash the vulva with clean warm water every day. Wash from front to back, not from back to front, so as not to bring dirt or bacteria near the anus to the vaginal opening. Never take a bath or swim in the bathtub. Sanitary napkins should be changed frequently, because the accumulated menstrual blood will stimulate the vulva skin and cause inflammatory infection. Take sanitary napkins when you go out during menstruation.

Second, pay attention to the combination of work and rest before and after menstruation, don't be too tired, don't exercise vigorously. Be sure not to stay up late, work and rest regularly. If you meet physical education class or a sports meeting during your menstrual period, you'd better ask the teacher for leave and don't engage in excessive and strenuous sports activities.

Generally, the first day of each bleeding of a girl's menstruation for several days is called the beginning of the menstrual cycle, and the time between the first days of two menstruation is called a menstrual cycle. Generally, the menstrual cycle is 28 ~ 30 days, and 7 days before and after dislocation belongs to the normal range. Under normal circumstances, each menstrual bleeding lasts for 2 ~ 7 days, and the blood loss per time is about 50 ~ 100 ml. However, the loss of menstrual flow is not easy to calculate, and it can only be roughly estimated by how many times the menstrual pad is changed every day, and the bleeding is the most on the second to third day.

Female physiological period refers to menstrual period. Generally speaking, women's physiological period refers to mature women's menstruation once a month, that is, menstrual period. Normal women of childbearing age have 1 menstrual cycle every month, which is called 1 menstrual cycle from the beginning of this menstrual cramp to the next menstrual cramp. From the perspective of contraception, every menstrual cycle of women can be divided into menstrual period, ovulation period and safety period.