The whitening of the inner circle of the newborn’s lips may be caused by thrush, excessive friction, and more delicate skin and mucous membranes. 1. Thrush: Thrush is mainly caused by Candida albicans, due to the body’s low immune function and unhygienic oral cavity, the long-term use of antibiotics and other causes. 2. Excessive friction: Thrush is caused by excessive friction of the lips when the newborn sucks hard, and does not require special treatment. 3. The skin and mucous membrane is more delicate: due to the newborn’s skin and mucous membrane is more delicate, so in the breastfeeding, sucking too hard, there will be white around the phenomenon, is a normal phenomenon, do not have to worry. There may be other reasons for the whitening of the inner circle of the lips of newborns, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.