Dehydration fever occurs when the amount of water lost from breathing, skin and stool exceeds the amount of fluid obtained from feeding the newborn. When the weather is dry or hot, or the room temperature is too high, or the warmth is too high, the newborn can lose too much water in the body, and if the supplement supply is not enough, it can lead to fever. Neonatal dehydration fever occurs 2-4 days after birth. The newborn may show irritability and crying, but the general condition is still acceptable. No symptoms of infection and poisoning, the body temperature can suddenly rise, sometimes up to 39-40 degrees, weight can drop, fontanelle slightly depressed, dry mucous membrane of the mouth and lips, poor skin elasticity, reduced urine volume, physical examination and laboratory tests did not find other diseases, body temperature drops rapidly after supplying sufficient water. Preventive measures: 1. keep the room temperature between 22℃-28℃ 2. don’t dress the child too much and too thick. 3.If there is not much breast milk, it is better to add 20-30 ml of warm boiled water or glucose with a concentration of 5% between feedings. 4.New parents should pay attention to avoid overheating of the ambient temperature and pay attention to hydration. Lower the indoor temperature, but not immediately open the windows and doors to play, the temperature drops too fast, it is also not good for babies and children. 5, in winter, you can sprinkle some water indoors and open the bedroom door.