Blisters in the baby’s mouth are usually seen in herpes stomatitis, which is caused by herpes simplex virus infection. It is usually accompanied by high fever and manifests as single or clustered small herpes surrounded by a red halo on the oral mucosa of the gums, inner lips, tongue, and cheek mucosa, which can break down rapidly to form ulcers. Usually the child shows symptoms such as refusal to eat, salivation, irritability, etc. The duration of the disease is about 1-2 weeks. The main treatment is to keep the mouth clean, drink more water, rinse the mouth with mouthwash, prohibit irritating drugs, and apply local rehabilitative new liquid or spray watermelon cream, tin type dispersion, etc. If accompanied by high fever that does not subside, the course of the disease for more than 3 days may be secondary to bacterial infection, you can use antibiotics together with treatment, eating a slightly warm or cool liquid is appropriate.