When abnormal vaginal bleeding is ruled out, such as the presence of irregular and irregular vaginal bleeding, it is generally normal for a woman to have her period at the age of 11 and to grow taller after the first menstruation. Menstruation is a phenomenon in which estrogen stimulates the endometrium to proliferate and shed periodically. Height is influenced by genetics, nutrition, growth hormone and other factors. The onset of menstruation is an important sign of puberty, usually occurring between the ages of 11 and 18, with most occurring between the ages of 13 and 15. The time of first menstruation varies depending on the individual’s development, and can be within the normal range at age 11. At the beginning of menstruation, the body has not yet developed a stable hormonal feedback mechanism, so occasional irregularities are normal, and usually after 5-7 years, the ovulation cycle is normal, and the menstrual cycle will gradually become normal. After entering puberty, height can continue to grow, and puberty is a peak period of height growth for girls, during which height growth is faster and usually not interfered with by menstruation. If you are worried about height growth, you can go to the hospital for an X-ray examination to determine whether the epiphysis is closed or not, as puberty is an important period for height growth and the epiphysis usually does not close completely and can continue to grow. At this stage, you can appropriately supplement some food rich in protein, vitamins, calcium, phosphorus and other nutrients, and you can also appropriately increase physical exercise to promote bone growth and accelerate height growth.