To make breasts bigger during the developmental period, girls should pay attention to supplemental nutrition, wear appropriate underwear, enhance exercise and eliminate unfavorable factors that affect development. However, the final size of the breasts also depends on the genetic influence, and should try to eliminate the use of drugs, prescriptions and other methods that have no clear effect, and are not suitable for surgery. I. Favorable behavior 1. Supplementary nutrition: first of all, you need to supplement enough protein, you can properly eat more eggs, milk, meat and other foods, and avoid eating more puffed food, fried, barbecued and other high-calorie and low-nutrition foods; 2. Choose the right underwear: because the developing breasts need a certain amount of space for development, you should choose comfortable and well-supported underwear, and you should not wear too tight, so that the lower edge of the underwear and Between the skin, can put a finger of the elasticity is appropriate. Combined with different scenarios can change underwear, such as sports use professional sports underwear; 3, enhance exercise: under the premise of balanced nutrition, regular exercise helps to increase the amount of muscle in the body. Especially push-ups, push-ups, chest expansion exercises and other movements, can exercise the pectoralis major, pectoralis minor muscles and other parts of the muscle. And exercise can promote blood circulation, supplemented by appropriate massage, which helps to promote nutrient transport, it is recommended that girls exercise under the guidance of professionals. Second, the need to eliminate the behavior of 1, bad work and rest and emotions: girls in life should maintain a soothing mood, avoid long-term tension, anxiety, depression and other bad mood. Avoid staying up late and ensure adequate rest is also very important for development; 2, drugs and surgery: girls in the development period are not recommended to take breast enlargement drugs, prescriptions, or breast enlargement surgery, to prevent their side effects affect the normal development. Breast development is also affected by genetic factors, the role of personal behavior is limited, it is recommended that developing girls do not care too much about the size of the chest, with a healthy chest is the most important.