Dehydration fever is a phenomenon in which the body temperature rises due to the decrease in water evaporation from the skin after severe dehydration (especially in children), which affects the body’s heat dissipation. When the room temperature is too high through the skin heat dissipation increases, if at this time the body is not enough water, blood concentration, easy to make the newborn baby dehydration fever. The sweat glands are not fully developed and cannot carry away the heat from the body through sweating, so the body mainly relies on physical convection to dissipate heat. 38.2 degrees or more is better to go to the hospital. When the room temperature is too high, heat dissipation through the skin increases, and if the body is not sufficiently hydrated and the blood is concentrated, dehydration fever can easily occur in newborns. The internal and external factors that cause dehydration fever are described below: I. Internal factors: 1. 2. The development of the thermoregulatory center is also not perfect. 3. Sweat glands are not fully developed, so they cannot take away the heat from the body through sweating, and mainly rely on physical convection heat dissipation. External factors: 1. In the hot summer. 2.The indoor temperature is too high. 3.Small babies and children are wrapped tightly, and the heat in their bodies cannot be dissipated. 4. Not enough water is added.