There is a layer of white film on the inside of the baby’s lips that is physiological and may also be pathologic factors such as thrush. 1. physiological factors: as the baby salivary glands begin to develop, there will be a small amount of saliva in the mouth, if the baby drank milk, milk left in the mouth, a small amount of saliva can not dilute the milk, so the baby’s lips will have a layer of white film. Physiological factors lead to a layer of white film in the lips can be given to the baby after drinking water to wash off. 2. Thrush: If Candida albicans infection on the surface of the oral mucosa to form a white patchwork of disease, the baby’s mouth is visible in the mucosal surface covered with white clot-like pieces, not easy to erase. Baby lips inside a layer of white film, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.