Fever refers to the dysfunction of the body’s thermoregulatory center caused by the action of pyrogen or various reasons, and the body temperature rises beyond the normal range. 8-month-old infants with fever of 39℃ are moderate fever, and the methods of rapid cooling include physical cooling and medication cooling. After rapid cooling, attention should be paid to the diagnosis and treatment of the original disease. A rapid cooling methods 1, physical cooling, direct effect on the skin, blood vessels due to stimulation and passive expansion, accelerate the distribution of body heat. (1) warm water bath: put half a tub of hot water with a water temperature lower than the body temperature of the child 1 ℃, gently put the child into the tub, soak the whole body except the head for 5-10 minutes, after soaking, use a large towel to quickly dry the whole body and put on clothes; (2) ice: place an antipyretic patch or ice bag on the forehead of the baby to cool the head; (3) hot water bag: place a hot water bag on the bottom of the baby’s feet to promote (3) hot water bag: place a hot water bag on the baby’s feet to promote sweating and enhance the baby’s comfort. 2. Drug cooling: you can choose ibuprofen suspension and antelope granules. Parents should avoid empirical use of antibiotics for the infant and should follow medical advice after initial confirmation of bacterial infection; 2.