Breast size can be improved by wearing adjustable underwear, physical exercise, surgery, etc. Adolescent women in the development stage will also appear breast size, generally do not need to be particularly worried about, in the development process will gradually form a uniform size. 1. Adjustable underwear: breasts are mainly composed of fat and mammary tissue, usually wear adjustable underwear, appropriate supplementation of breast-enhancing foods, breast size can be improved. 2. Physical exercise: Appropriate physical exercise, such as chest expansion, swimming, etc., can also improve the situation of the two sides of the breast size discrepancy. 3. Surgery: Breast augmentation surgery on smaller breasts to achieve the same size of both breasts can improve the situation of different breast sizes. Different breast size is mainly due to embryonic development, resulting in abnormal breast development, thus causing different breast size, is a normal physiological phenomenon, but does not rule out other reasons for this, it is recommended to go to the hospital for further examination to clarify the cause.