If a two-year-old baby has a white tongue, it is considered to be caused by two conditions: 1. caused by cold in the body, if children blow air conditioning or eat cold drinks in summer, it will lead to cold and dampness in the body. In this case, children tend to have white tongue coating, and accompanied by clear runny nose, abdominal pain, diarrhea and other symptoms. In this case, parents can apply patchouli oral liquid to the child; 2. Due to the dyed moss caused by drinking milk, two-year-old children drink more milk, milk will be dyed on the top of the child’s tongue, resulting in white tongue moss. For this situation, parents can let children rinse their mouths or brush their teeth. After rinsing the mouth and brushing the teeth, the children’s white tongue will be significantly improved and reduced.