Fever, or abnormally high body temperature, is the most common symptom in children caused by viral or bacterial infections or other diseases. Parents are generally fearful of fever in infants and tend to overuse antipyretic drugs, which in turn can have a negative impact on the baby’s health. So, what is the right way to deal with fever in infants? First of all, it is important to have a correct understanding of infants’ elevated body temperature. In fact, children have poor thermoregulation ability, so the temperature increase is usually more obvious than that of adults, and the temperature fluctuation range is also larger than that of adults. Secondly, we should learn to judge the body temperature of children correctly. The normal basal body temperature of children is between 35.9℃ and 37.2℃ in the axilla, and generally when the body temperature exceeds the basal body temperature by more than 0.5℃, it can be considered as fever. Those who do not exceed 38℃ are called hypothermia, and those who exceed 39℃ are considered hyperthermia. In addition, it should be noted that the high or low temperature of a child’s body does not fully indicate the severity of the disease, and a high fever does not necessarily indicate a critical condition; on the contrary, sometimes the condition is very serious but not necessarily febrile. Therefore, parents should not be too nervous about the fever if the baby’s general condition is good in terms of eating, stool and mental reaction, and is not accompanied by vomiting, diarrhea, depression or progressive aggravation of cough. It should be reminded that many infants, especially newborns, who come to the hospital with fever, are examined and the doctor finds that the cause of the low fever is too thick wrapping or too high room temperature. Therefore, when parents find that their baby has a fever, they should first make an objective assessment of whether it is just after the baby has cried, or just after a hot bath, or if it is too hot, overdressed, or poorly ventilated indoors. Parents should not wrap their babies more or cover them more thickly because they are concerned about their babies getting cold, and the room should be kept airy and at the right temperature. Generally speaking, the treatment of infants with low fever can be done by physical cooling alone, especially for small infants within 3 months. The specific approach is, first of all, reduce the cover, take off the thick wear, open the swaddling clothes or wrapped bedding, so as to facilitate the child’s body heat dissipation; at the same time, you can reduce the ambient temperature by opening the window ventilation. Secondly, you can use ice bags, hot water bags or plastic bags, filled with cool water, you can also use towels soaked in cool water wrung out and wet compresses; placed in the back of the pillow, forehead, armpits, thighs and other parts. In addition, you can use warm water to wipe your body with gauze or small towels soaked in warm water and then wipe the parts with more vascular distribution, such as the neck, armpit, thigh root, N fossa (i.e., the flexor side of the knee joint), hands and feet, etc. These parts have fast blood circulation and superficial blood vessels, so it is easy to dissipate heat.