A fever in children is a higher than normal body temperature. The normal body temperature in children is 36.5~37.5℃ for anal temperature and 36~37.2℃ for axillary temperature, with the anal temperature being about 0.5℃ higher than the axillary temperature. For various reasons, we usually measure the axillary temperature as the standard, and when the axillary temperature is 37.3℃ or higher, it is considered fever. Fever can be divided into several categories according to the body temperature. A body temperature of 37.5 to 38℃ is a low fever, a moderate fever is a body temperature of 38.1 to 39℃, a body temperature of 39.1 to 40℃ is a high fever, and a fever of 41℃ or more is a super high fever. Super high fever is something that must be taken very seriously, but low fever is not unimportant. The fever is graded just so that the doctor can have a better understanding of the fever type, and it is important for parents to pay attention to both. Of course, it is not necessarily abnormal for a child to have a high temperature measured once in a while, such as after strenuous exercise, crying, breastfeeding and other normal physiological activities, the temperature may also rise for a short period of time, but the child has no other discomfort and is in good spirits. These causes of elevated body temperature will soon return to normal levels without any treatment. Keep an eye on your child’s temperature changes, wait for your child to be quiet, wipe sweat and then try the temperature again. When your child has a fever, you should investigate various aspects, identify the cause, and treat the fever according to the degree of fever and the cause of the fever.