A child’s general axillary body temperature exceeds 37.5 ℃ is considered a fever. Normal human body temperature is relatively constant, body temperature exceeds the maximum limit of normal body temperature is fever, which is often referred to as fever. Generally speaking, the axillary body temperature in 36 ~ 37 ℃ is the normal body temperature, by the environment, diet, exercise and time and other factors, body temperature will fluctuate, as long as the body temperature does not exceed 37.5 ℃, are considered normal. Therefore, a child’s underarm temperature exceeds 37.5 ℃ is considered a fever. Causes of fever in small children are more reasons, generally there is inflammation and infection in the body, commonly upper respiratory tract infection, the child in addition to fever, there will be coughing, runny nose, nasal congestion and other symptoms. Children with a body temperature of 37.5 ℃ or more is fever, for children with fever, parents should give the child more water, with warm towels to wipe the skin, to achieve the purpose of cooling down, and at the same time need to consult a doctor in time.