Baby nipple inversion may belong to normal physiological phenomenon, it may also be caused by breast tumor, mastitis and other factors, parents are advised to take their babies to the hospital in time for examination and treatment after a clear diagnosis. 1. Physiological phenomenon: Due to the baby’s young age, the level of sex hormone secretion is not high, so the phenomenon of nipple inversion will occur, usually with the growth of age, the body will increase the secretion of glandular hormone, which will be normalized. 2. Breast tumor: the baby’s breast tumor will cause nipple inversion, mainly because the tumor invades the ducts of the breast and pulls the nipple excessively, thus leading to nipple inversion, in this case, it is necessary to combine the baby’s own situation and the doctor’s guidance to carry out surgical treatment. 3. Mastitis: Inverted nipples in babies can also be caused by an infection in the breast. In addition, the symptoms of mastitis may be red, swollen and hot, and localized pus, etc. You can use hot towels to apply warm compresses. You can use hot towels to apply warm compresses, and it is recommended to apply antibiotic treatment under the guidance of the doctor, such as ceftriaxone. Baby nipple inversion may also be congenital nipple inversion. In daily life, if you find baby nipple inversion. Be careful not to squeeze or knead it with your hands frequently, so as not to cause inflammation or infection. You can apply some skin care products that nourish the skin appropriately.