Baby ulcers usually occur because of vitamin deficiency or because of decreased immune function, as well as some disease factors, such as ulcerative pharyngitis. The following treatments can be given when ulcers appear: 1. You can give your baby more vegetables and fruits with more vitamin C to assist in the treatment. 2. You can give your baby oral multivitamins to assist in the treatment. 3. You can give vitamin B2, grinded into powder with vitamin AD drops, and apply it to the ulcer to help the ulcer heal. 4. You can give a spray with open throat sword to spray on the ulcer, which can 5.When combined with bacterial or viral infections caused by ulcers in the mouth, oral cephalosporin or penicillin anti-inflammatory drugs, as well as the corresponding antiviral drugs can be given for treatment.