When your baby has ulcers in the mouth, you can take the following treatment measures: i. Use a liquid or semi-liquid diet: such as rice porridge, thin rice, etc. to avoid pain from hard foods that scratch the mucous membrane. II. Change the feeding method: minimize the sucking action to promote the healing of the ulcer. Third, apply drugs: the lesion area can be coated with gentian violet or melanin, avoid using corrosive drugs. IV. Adjust the diet: fresh fruits can be juiced and taken, and more nutrient-rich milk and eggs can be eaten to replenish vitamins and speed up healing. Fifth, trim the too short tongue tie: grind and change the sharp edges of the teeth to reduce irritation. Six, correct bad habits: for example, the baby chewed the bad habits of toys to avoid mucosal damage. Seven, wipe the oral mucosa: parents can apply wet gauze or warm water to wipe the oral mucosa to avoid the multiplication of a large number of bacteria.