A child’s body temperature of 37.8°C is considered feverish. The normal axillary body temperature in children is usually below 37°C. If it is above 37°C, it is considered a fever. A low fever of 37.8℃ in children is commonly seen in infectious diseases, such as colds, etc. It can also be seen in diseases such as hyperthyroidism and dehydration. Parents do not need to be too nervous for the time being, they can give physical cooling, such as warm water to wipe the forehead, bilateral armpits, palms, feet and other parts of the body, or use antipyretic patches to effectively reduce the temperature. If the child’s temperature continues to rise, accompanied by dizziness, runny nose, weakness, drowsiness and other symptoms, it is recommended to go to the pediatric department of the hospital to have blood tests to determine the cause of the illness and then provide targeted treatment. If the child’s body temperature fluctuates around 37.8℃ for several times and there is no other discomfort, the child can be treated without antipyretic drugs for the time being, and the lost water can be replenished by drinking more water.