Breast development of a 10-year-old girl is usually a normal physiological phenomenon and will not affect her height. The pubertal development of girls starts at the age of 9 to 12, and the development time lasts for about 4 years. After entering puberty, the first secondary sexual characteristics is breast development, in this stage of height, weight will also be rapid growth. Therefore, a 10-year-old girl with large breasts will not affect her height. However, if a girl’s breasts develop before the age of 8, she will have precocious puberty and her height will be affected in adulthood. In this stage of pubertal development, attention should be paid to balanced nutrition, sports and exercise, which will help the child’s height growth. The emergence of maladjustment timely go to the hospital for consultation and treatment.