Breast development is mainly related to hormone levels The growth and development of the breast is mainly influenced by a variety of hormones in the reproductive endocrine axis, such as gonadotropin and lactogen secreted by the pituitary gland, estrogen and progesterone secreted by the ovaries; in addition, the hormones secreted by the adrenal gland and thyroid gland, and growth hormone secreted by the pituitary gland are also needed for the full and perfect development of the breast. In clinical practice, doctors often encounter young girls whose development is terminated prematurely, most likely due to the dysfunction and regulation of the above organs, glands and hormone levels, which affects the development of breasts. The problem of breast development is not an isolated phenomenon, it is one of the manifestations of the entire secondary sexual characteristics, so when determining whether breast development is normal or not, it must be analyzed together with other secondary sexual characteristics. If all the other sex characteristics are developing normally, but only the breasts are not developing, it is likely that the problem is with the breasts themselves, such as the breasts are not sensitive to the hormones mentioned above, or the level of a specific hormone is not normal. If the entire secondary sex characteristics are not developing, then it is time to go to the hospital for a serious examination. In addition, breast development can be affected by genetic factors, nutrition, climatic conditions, and the environment in a variety of factors. The most important thing is to eat more high-protein food and do more breast enlargement exercises to build your breasts. When your breasts start to develop during puberty, don’t wear a bra too early. You can start wearing bras after your breasts are fully developed, but the degree of tightness should be moderate, and you should not tighten your breasts too much because you are shy. During the process of breast development, sometimes there is a slight swelling or itchy feeling, do not squeeze or scratch with your hands. At this stage, you should pay attention to not blindly dieting and partial dieting in the one-sided pursuit of curves. The intake of moderate protein food can increase the amount of fat in the breasts and keep them full. Therefore, it is recommended to eat more fish, meat, poultry, eggs, vegetables and fruits, etc. In terms of exercise to do a good job of breast fitness. Mainly to strengthen the chest muscle exercise, such as appropriate more chest expansion exercises or push-ups, chest expansion aerobics, etc.. It is worth mentioning that swimming is a sport that can promote the development of breasts, and children who start swimming from childhood have a significantly better body shape than children of the same age. Appropriate breast massage in the morning and evening can also promote the role of nerve reflexes, improve the secretion of the pituitary gland. Finally, we also need to pay attention to the psychological regulation of adolescent girls, do not put too much pressure on children, so that they grow up in a free and healthy and relaxed environment.