7-year-old girl breast development belongs to precocious puberty, if true precocious puberty to use drugs. It is recommended to consult a doctor in time to clarify the cause of precocious puberty, determine whether it is pseudo precocious puberty or central true precocious puberty, and then determine whether treatment is needed. 1. Pseudo precocious puberty: there is no activation of the hypothalamic-pituitary-gonadal axis, just simple breast development, mainly related to excessive calorie intake, obesity, or excessive consumption of food containing estrogen, at this time no special treatment, can be solved by adjusting the diet, weight loss. 2. True precocious puberty: Pituitary dysfunction, hypothalamic dysfunction, hypothalamic-pituitary-gonadal axis starts too early may cause true precocious puberty, must be through a series of examination and test, can be judged as a true precocious puberty, can be in the guidance of a professional doctor for medication, such as Trifluprednin and leucovorin extended-release agent. If a girl’s breasts start to develop at the age of 7 weeks and a half, it is recommended that she consult a doctor in time for the relevant treatment under the guidance of the doctor. Eat a light diet, avoid stimulating foods, and eat less junk food, such as fried food and puffed food.