In most cases, breasts will stop growing after puberty. There is a certain degree of secondary development possible through weight gain, dietary adjustments and exercise, but the results vary from person to person. Breasts generally stop growing after puberty, i.e. they are basically fully developed at around 15-17 years of age. The so-called secondary development may occur when a woman gains weight after puberty and her breasts become larger due to the accumulation of fat tissue in the breasts, but the breasts will return to their previous size when she loses weight in this case. If you wish to stimulate breast enlargement, you can stimulate mammary gland development by eating more collagen-rich foods, doing more breast-expanding exercises, and breast massages, but this approach has limited effect on women who are not in the developmental stage.