Four-year-old children with yellowish thick tongue coating may be caused by indigestion or colds, the specific needs of the doctor specific analysis. 1. If a four-year-old child doesn’t like to drink water, his body belongs to the damp-heat constitution, which will lead to fire and heavy breath, and he will show the symptom of yellowish tongue coating. Give your child more water, eat some fruit, and eat less spicy and fried food. 2. Sometimes wind-heat colds can also cause four-year-old children with yellow tongue, some also accompanied by coughing, coughing phlegm and other symptoms. Usually, we should give the child to develop good habits, light diet, eat on time, drink more water, more exercise, eat more fruits and vegetables, to reduce the occurrence of accumulation of food, enhance the immune system. Four-year-old children with yellow tongue thick, there may be other reasons, it is recommended to go to the hospital, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.