Baby sleeping temperature 38.9 ℃ is usually considered fever, belong to abnormal, can be seen in a variety of diseases, such as respiratory infections, Kawasaki disease. For the baby is usually considered normal body temperature of 36 ~ 37.3 ℃, more than 37.4 ℃ for fever, due to the baby’s young thermoregulation center is not well developed, such as after eating, crying or thick wrapping, can also be transiently high temperature, such as 37.5 ℃, etc., for the but the baby’s sleeping temperature of 38.9 ℃, is generally considered to be in the state of the disease, belong to the abnormal situation. The above situation can be seen in a variety of diseases, such as early childhood emergency rash, often caused by human herpes virus infection, can appear at night fever, mostly in 3 ~ 5 days after the heat out of the rash. It can also be seen in Kawasaki disease, which can present with persistent fever, 38.9℃ at night, accompanied by symptoms such as skin rash, chapped lips and mouth, and some of them can have coronary artery dilatation. Clinical causes of fever are more, it is recommended that if the baby fever should be timely medical care, by the judgment of a specialist physician to clarify the diagnosis and timely treatment.