A girl of 11 years old has already had her first menstruation, which means that her secondary sexual characteristics have developed, and her height of 150 means that her height development is also normal. Menstruation does not mean that the height cannot grow, the height is not only related to genetic factors, but also related to nutrition and exercise, and the height of the girl’s height is closely related to her bone age and epiphysis. Some 11-year-old girls can reach the age of 14-15 years old, while some 11-year-old girls can be small, sometimes only 7-8 years old, and their height may increase significantly if they are small, while those who are old, especially those whose epiphyses are close to healing, may not grow too high. A girl’s height is related to her parents’ height and also to her nutritional status. A person who has been a vegetarian for a long time may not grow too high, and a person who does not like to exercise may not grow too high, so it can be seen that height is related to bone age and epiphysis, as well as genetics, acquired nutrition and exercise.