Fever is usually caused by upper respiratory tract infection. If the baby has oral mucosa rupture, redness, swelling, congestion and fever, herpes stomatitis, herpes pharyngitis or hand, foot and mouth disease are the main considerations. It is best to go to the fever clinic or pediatric internal medicine department for blood tests, CRP, EV71 and coxsackie virus. After the cause of the disease has been determined, the oral mucosa should be sprayed with rehabilitative solution and throat-opening sword spray. Give timely antiviral medication, such as Jinhua QingShen pellets, Lianhua FengFeng pellets, Pudilan anti-inflammatory oral solution, etc. Try to eat a mild and light diet, eat more vegetables and fruits to replenish vitamins and promote the recovery of the mucous membrane rupture.