Baby mouth ulcers are more painful, mostly due to oral infections, lack of B vitamins or zinc, systemic diseases, parents need to go to the hospital for examination and treatment after clear reasons to relieve the baby’s symptoms. Common causes and treatment 1, oral infection: such as herpes pharyngitis, herpes stomatitis, can cause the baby mouth ulcers, can follow medical advice to be anti-viral treatment, such as ribavirin spray, oral local can use compound boric acid solution, can also be supplemented with vitamin B, vitamin C; 2, nutrient deficiency: mainly due to the baby picky food, partiality caused by B vitamins or zinc deficiency, mouth ulcers. Need to improve the trace element examination, under the guidance of the doctor to supplement the appropriate amount of B vitamins or zinc; 3, systemic diseases: baby suffering from immune system diseases, such as leukodystrophy, in addition to recurrent mouth ulcers, but also accompanied by other system symptoms, such as swollen lymph nodes, vulvar ulcers, skin damage, eye damage, etc., need to promptly go to the hospital. There is no specific cure for the disease, but hormones and immunosuppressive drugs can be applied to control the development of the disease. Attention parents need to give their babies light food, eat more vegetables and fruits rich in B vitamins or zinc, such as grapes, peanuts and cabbage, but the temperature and concentration of food should not be too high to avoid stimulation, and drink more warm water. Also maintain oral hygiene and rinse your mouth after meals.