9-year-old breast bulge, height 140cm, may be due to the improved quality of life now, so that adolescents enter puberty early, the emergence of pubertal growth and development characteristics, but also may be the body hormone level disorder caused by the pathological phenomenon. A common cause and treatment 1, girls: girls 9 years old breast bulge, height 140cm, generally refers to the early puberty appear height growth, secondary sex characteristics development performance, usually should pay attention to wear some comfortable undershirt or underwear, should not wear tight underwear, so as not to affect breast development, or cause breast disease. It is recommended to go to the hospital to take bone age film and check hormone level to clarify whether there is early puberty. You can eat more protein and vitamin-rich foods to supplement nutrition, such as beef, mutton, milk, eggs, etc., to avoid malnutrition, so as not to affect physical development; 2, boys: boys 9-year-old breast bulge, height 140cm, may be rich in nutrition caused by the normal development of the body, but also may be the body’s increased secretion of estrogen, it is recommended to go to the hospital in a timely manner to do hormone checks and mammography, to clarify the cause after The cause of the problem can be identified and targeted treatment can be carried out. The family members can communicate with their children more often to relieve the negative emotions.