Breast development in eight-year-old girls suggests precocious puberty, which can be controlled through lifestyle modification or medication. 1. Life management: parents need to control the child’s diet, to avoid excessive intake of hormone-containing foods, such as anti-seasonal vegetables and fruits, but also to control the fried and high-calorie food intake, the diet should be light, easy to digest, nutritionally balanced, and consume more seasonal vegetables and fruits that are rich in vitamin C, to develop good habits, avoid staying up all night. 2. medication: eight-year-old girl breast development need to go to the hospital in time for examination, if necessary, can be under the guidance of a professional doctor for medication, such as megestrol acetate, cyproterone acetate and so on. When the eight-year-old girl breast development, parents should pay attention to the timely examination to the hospital as soon as possible to rule out breast disease, through life conditioning, drugs and other interventions to avoid premature development of organs leading to short stature.