A normal baby’s tongue should be thin and red, if the tongue is thick and yellow it usually indicates the following conditions: 1. The most common is the presence of obvious improper diet and indigestion. 2. Pay attention to the possible imbalance of the intestinal micro-ecosystem, the reduction of probiotics in the intestine leading to poor digestion and increased gas accumulation in the gastrointestinal tract causing a thick yellow tongue. 3. 4, to pay attention to whether because of intestinal virus or bacterial infection, intestinal mucosa damage caused by digestion and absorption function is reduced, resulting in thick yellow change of the tongue moss. 5, also pay attention to whether there are chronic diseases, such as genetic metabolic diseases, prone to poor digestion and digestive tract symptoms appear thick yellow tongue moss.