Baby more than 2 years old body temperature 37.5 ℃ is not normal, belong to the low fever, the temperature is low fever, to comprehensively analyze is caused by disease or non-disease causes. Non-disease causes may be the child drink less water, so the temperature will rise, or the child wears too much clothing, resulting in the child’s temperature rose, or due to the summer weather is particularly hot, which led to the child’s temperature rose. In these cases, the child does not feel any discomfort or have any symptoms, and the illness is not considered to be the cause and is considered normal. There are also disease causes, 37.5 ℃ is a transient low fever, may be a cold caused by the early temperature situation. If it is a prolonged low fever, do not rule out the presence of tuberculosis infection, rheumatism, or other specific diseases, immune function diseases. If the fever is prolonged, we need to take the child to the hospital for relevant blood and imaging tests to clarify the cause of the disease and then give further treatment.