Children with a body temperature of 38 ℃ is a fever, but is a low fever. Fever is a common symptom in pediatrics, usually considered normal body temperature is generally 36 ~ 37 ℃, 37.5 ~ 38 ℃ belongs to the low fever, 38.1 ~ 38.9 ℃ belongs to the moderate fever, 39 ~ 41 ℃ for the high fever, more than 41 ℃ for the ultra-high fever. For children with a temperature of 38 ℃ is considered elevated body temperature, in a feverish state. Fever can be seen in a variety of diseases, such as respiratory infections, Kawasaki disease or blood system diseases, and children in the temperature rise can appear muscle pain, headache or nausea and other general discomfort, for infants and young children can also affect the brain cells, abnormal discharges, often convulsions. It is recommended to consult a specialist to determine the cause of the illness and provide timely and appropriate intervention.