The breasts of women basically stop developing at the age of 2. When women are 1 to 12 years old, the hypothalamus begins to secrete gonadotropin, which leads to the secretion of gonadotropin by the pituitary gland, which further stimulates the secretion of estrogen and lutein by the ovaries. Estrogen stimulates the development of mammary duct, while progesterone stimulates the development of acinus, resulting in the rapid growth of adolescent breast tissue. Female breast development is divided into five stages, and general puberty breast development is divided into five stages. A. the first stage: nipple protrusion. B. The second stage: from the age of ten to twelve, the breasts begin to develop, the areola also becomes larger, and the breasts form a hill. C. Stage III: About thirteen to fourteen years old, nipples and breasts continue to develop. D. Stage IV: From the age of fourteen to fifteen, the areola and nipple begin to bulge, and the breasts gradually become spherical. E. Stage 5: After the age of fifteen, the breasts gradually mature and finalize the design. At the age of 2, it basically stops developing. How to effectively promote breast development? Before the age of 18, women's self-estrogen secretion is still in a vigorous period, so they can supplement more nutritious and balanced foods to promote breast development, such as pig's trotters, jellyfish, papaya and red dates. If you find that the breast is obviously slow to develop in the middle and late stage, you can go to a regular hospital to help dredge the breast through acupoint massage and other methods. Don't encourage others to take hormone drugs by themselves, which will lead to endocrine disorders. After the age of 2, human hormone secretion is balanced, and breast development is basically completed. If the breast development is still not completed and the chest is flat after this age, at present, prosthetic breast enhancement and autologous fat breast enhancement are the only recognized safe and effective "postnatal breast development methods". Autologous fat breast enhancement: It is suitable for those with flat chest and large accumulation of local fat such as waist, abdomen or thighs. Autologous fat breast enhancement is a breast enhancement method that injects fat particles from the abdomen, waist, buttocks and legs with local fat accumulation during liposuction to lose weight, so as to make them plump. Generally, it takes 3~5 injections to achieve the desired effect. Prosthesis breast enhancement: suitable for those with flat chest, asymmetric size or sagging breasts. Prosthetic breast enhancement is to implant a silicone gel prosthesis into the breast (under the breast or pectoralis major) in a minimally invasive way, and the fullness effect can be seen immediately after operation. Prosthetic breast enhancement is suitable for any poor chest shape, and there are many models and styles of prostheses. Plastic surgeons can tailor the appropriate size and shape according to your body shape and ideal breast size, so it is also a favorite breast enhancement method for many stars. Breast augmentation prostheses are divided into three types: domestic, joint venture and imported. As long as they are regular and qualified prostheses, they are very compatible with people, generally do not cause rejection, and do not affect postoperative breastfeeding. They are widely suitable for women with poor breast development.