Early childhood emergencies are usually characterized by sudden onset of high fever without other clinical manifestations, enlarged lymph nodes behind the ears or occiput with tenderness, leukopenia, lymphocyte hyperplasia, and most of the cases occur within two years of age, with a temperature of 39 to 40 degrees Celsius, and a fever of three days, with a rash appearing after the fever has subsided. At first on the trunk, and then spread to the whole body, the rash is maculopapular, the pressure of the discoloration, the rash subsides after no flaking, no pigmentation. Therefore, young children need to go to the hospital in time if there are symptoms of discomfort.