If your baby has a round ulcer inside the throat, it is caused by a lack of vitamins. Try to give your child more juice to be able to replenish the vitamins and promote the healing of the ulcer, and you can consider spraying with open throat sword spray and watermelon cream spray for treatment. In order to prevent infection, babies must actively rinse their mouths after eating to avoid food residues causing ulcer infection, which is not conducive to recovery and can aggravate the child’s sore throat. You can also let your child gargle with light salt water, which can play an antiseptic role. To avoid picky eating, children should eat more green leafy fresh vegetables, apples, pears and grapes to replenish vitamins, which can effectively prevent throat ulcers in children.