An 8-month-old baby with 37.5℃ is considered to have a fever, which belongs to a low fever. There are two main reasons for this: First, it is not due to a disease, but is caused by a physiological state, such as parents dressing the baby too much, the baby drinking very little water, or in the hot summer months, which can lead to a slightly high temperature. Usually to reduce the clothing wear, drink more water, reduce the temperature of the environment, the child’s temperature can be reduced to normal, no treatment is required. Second, disease factors lead to, may be the pre-cold fever, may be the child will be accompanied by sneezing, runny nose and other symptoms, may also be the early symptoms of gastrointestinal disease, there will be a low fever performance, may be followed by fever will occur after nausea, vomiting, diarrhea and other situations.