White tongue coating in infants may be a physiological phenomenon, or it may be caused by suffering from indigestion and other diseases. 1. If infants do not clean their mouths in time after eating milk, some of the milk will remain on the surface of their tongues, thus manifesting the phenomenon of white tongue coating, which can be removed in time after feeding water. 2. When the baby eats too much, the digestive function decreases, or breastfeeding mother eats too much greasy, spicy food, it will lead to indigestion of the baby, manifested as thick white tongue, vomiting, anorexia, bad breath and other symptoms. There may also be other reasons for a baby’s white tongue, so it is recommended to go to the hospital in time for a complete examination to determine the cause of the problem, and then give targeted treatment or therapy under the guidance of the doctor.