Usually girls will still grow taller if they menstruate at the age of nine, and normal menstruation has no effect on height. Generally, the growth of height is related to the epiphyseal closure, precocious puberty and other factors. Usually, a girl who has her period at the age of nine can still grow taller, so don’t worry too much. Menstruation at the age of nine is a normal physiological condition, which does not adversely affect the development of height. Usually when a woman is 12-13 years old is the period of rapid growth in height, during this period need to strengthen the intake of nutrients, reasonable combination of meals, appropriate exercise, help growth and development. Research shows that height growth is mainly related to epiphyseal closure and sexual maturity, if sexual maturity is too early, it will easily lead to early epiphyseal closure, which will affect the normal development of height. In addition, other factors affecting height include genetics, nutrition, living habits, and the environment. All in all, when a girl is menstruating, she needs to strengthen her daily life management and pay attention to all aspects of her body’s development. If there is any abnormality, you need to go to the hospital in time.