What should I do if a one-year-old child has mouth ulcers?

When a one-year-old child develops mouth ulcers, it is important to identify possible causes such as trauma, infection, or vitamin deficiency. Parents can take the following measures: 1. Correct不良 habits: Ensure the baby does not bite their lips or tongue, to reduce irritation to the oral mucosa. 2. Adjust diet: Encourage the child to eat foods rich in vitamins, such as oranges and kiwifruit, to promote healing of the oral mucosa. 3. Local treatment: Use infant-safe oral ulcer sprays or gently wipe the affected area with saline solution to relieve symptoms and support ulcer healing. 4. Prevent infection: Maintain good oral hygiene for the baby and avoid food residue that could lead to bacterial growth. 5. Seek medical help: If the ulcer does not heal within a prolonged period or if pain is severe, promptly take the child to the hospital's dental or oral medicine department for accurate diagnosis and targeted treatment.