Inverted nipples are usually congenital. It is one of the most common congenital malformations of the breast and is mainly caused by the short ducts of the breast, which pull on the nipple tissue. Nipple invagination can occur bilaterally or unilaterally, and it is generally believed that this type of abnormality is associated with the influence of certain genetic factors. In addition, cancer, surgical factors, trauma or fibrosis after mastitis can also cause nipple invagination. The glands, blood vessels, and nerves surrounding the nipple are extremely rich and secretive. In women with congenital nipple invagination, pregnancy after marriage can aggravate nipple invagination and prevent the baby from sucking, thus seriously affecting breastfeeding, as well as leading to acute mastitis due to milk stagnation and secondary infection. The correction of nipple invagination, generally according to the degree of invagination and take different methods: 1, light, moderate nipple invagination by doing their own nipple cross exercise plus pulling can be corrected. The specific practice is: once a day in the morning and evening, 5-10 minutes each time. Inverted nipples are generally more difficult to pinch, the other hand can help to press the areola downward, so that the nipple protrudes outward. 2, the market has produced negative pressure nipple suction device sold, the nipple will be sucked out and then pulled, nipple cross exercise from the breast development can be carried out after maturity, the earlier the effect is better.