If a three-year-old baby has ulcers on his tongue, there are several reasons: first, it is caused by a viral infection, at this time you need to take oral antiviral drugs, such as busulfan, Qingkailin, etc.; second, it may be caused by a lack of vitamins, which requires eating more fruits and vegetables and drinking more water; third, if the tongue ulcers recur, there may also be a zinc deficiency, you need to check the trace elements to determine, if You can take zinc gluconate orally if it has been determined, and you can’t be picky or paranoid, as picky and paranoid eating will only aggravate zinc deficiency. If you have an ulcer on your tongue, you should not eat too hot, too dry, too spicy, too acidic, which will aggravate the local pain, and you can rinse your mouth with rehabilitation liquid to promote the healing of the ulcer.