The development of breasts in girls at the age of 7 is an anomaly, because the appearance of secondary sexual characteristics in girls before the age of 8 belongs to the category of precocious puberty. Most of the causes of precocious puberty in children are due to early sexual development, in which case it is necessary to inhibit sexual development in time and slow down the process of sexual development, so that there is room for height growth. Children can be tested for sex hormone levels and bone age. If it is clear that there is true precocious puberty, it is necessary to apply gonadotropin-releasing hormone analogs to the child, and the height of the child will gradually improve after the application of drug intervention.