The body temperature of a newborn infant is 36-37.2℃ is the normal range, more than 37.2℃ is fever. The thermoregulatory center of a newborn baby is not yet perfect, so excessive insulation and high room temperature can cause fever. At this time, the main performance of the face is more red, the body temperature can reach 37.5 ℃, or even 38 ℃, but the child’s other state is okay. At this time, we should pay attention to open the package, gradually dissipate heat, usually do not wrap the child too tightly, the room temperature at about 22 ℃ can be. Children’s body temperature fever is divided into mild and moderate and high fever, mild fever is also known as low fever, refers to the fever below 38 ℃; 38-39 ℃ belongs to moderate fever; more than 39 ℃ belongs to high fever; more than 41 ℃ belongs to ultra-high fever. Generally, when the body temperature exceeds 38.5℃, we should consider applying antipyretic drugs. However, there is no suitable antipyretic medicine for children under two months old, and the main focus is on physical cooling, which can be done by taking a warm bath.