Small breasts during the developmental period can be made bigger through suitable underwear, supplemental nutrition and more exercise. 1. Suitable underwear: puberty is the best period for breast development. During this period, good underwear must be chosen. The best underwear is based on the distance between the breasts and the underwear, which can accommodate one or two fingers, and wear it to feel very comfortable and move freely only, which is conducive to the development of breasts. 2. Make up good nutrition: the growth of breasts must have enough nutrition. Adolescence is the period of breast development. First of all, you need to supplement enough protein, you can eat more eggs, milk, meat and other foods, avoid eating more puffed food, fried, barbecue and other high-calorie low-nutrition food. 3. Exercise: Doing more exercise is very beneficial to the development of the body, especially the expansion of the chest. However, it is better for developing children to grow naturally. It is recommended not to use any drugs for breast augmentation, which will cause serious damage to the body.