During pregnancy, the placenta not only replaces the ovary, but also secretes a lot of estrogen and progesterone, and the placenta also begins to secrete growth hormone, plus prolactin secreted by the anterior pituitary gland. Under the nourishment of these four hormones, the breast volume increases obviously, especially the expansion of breast tissue is the main factor of the volume increase.

After weaning, the breasts begin to contract, sag and relax. In particular, the injection of anti-breast drugs has accelerated the deformation of breast volume. The main reason is that the milk in thousands of acinus in the breast fades, the acinus gradually shrinks or disappears, and the liquid stored in progesterone is also discharged. If you want to restore the size and shape of your breasts to their pre-pregnancy appearance, you should focus on the fat cells in your breasts. Estrogen secreted by placenta during pregnancy is mainly estriol, which has little effect on the growth of adipocytes. Prolactin can also inhibit the growth of fat cells, thus preventing fat cells from squeezing the enlarged space of acinus. In addition, prolactin can stimulate the release of triglycerides stored in fat cells and transform them into raw materials for making milk. In fact, most fat cells shrink in size during pregnancy and lactation. Especially brown fat cells. Breast with increased volume and weight will scatter muscle tissue and skin tissue, making the fibers of muscle and skin lose elasticity and compactness. When the volume and weight are reduced, the breasts will appear slack and drooping. Help the fat cells in the breast grow and regrow, tighten the pectoralis major muscle that supports the breast (muscle re-education is another important function to simulate bioelectric current, and restore the tension and strength of relaxed muscle fibers), increase the number of elastic fibers in the dermis, and increase the thickness of collagen in the supporting fibers in the dermis. Elastin and collagen are both synthesized from amino acids. Therefore, taking enough amino acids can not only synthesize estrogen receptor protein, but also enhance the compactness and elasticity of skin tissue and reduce the dents on breast skin. Postpartum atrophy, relaxation and sagging breasts should absorb enough glucose, fatty acids and amino acids, and with external forces, the size and shape of the breasts should be able to restore their pre-pregnancy appearance.