Body temperature is an important vital sign reflecting the baby’s health status, and its normal body temperature is between 36.3℃ and 37.3℃. The body temperature of newborns is slightly higher than that of adults because the development of the center controlling thermoregulation in the brain of newborns is still immature, i.e., the ability to control body temperature is weak, so it is vulnerable to the influence of environmental temperature. If the baby does not have fever, cough, phlegm, diarrhea, abdominal pain and other discomforts, parents should not worry too much. For mildly elevated body temperature, attention should be paid to drinking more water, urinating more often, and eating more fresh vegetables and fruits. If the body temperature is above 38℃, it is necessary to seek medical attention, improve chest X-ray, blood routine, blood amylase measurement and other examinations, actively identify the cause, and perform anti-infection and heat treatment if necessary. Usually, physical cooling or oral ibuprofen suspension can be taken to control the body temperature in the normal range to prevent febrile convulsions or bronchopneumonia. In addition, if the body temperature of newborns is too low, it can lead to reduced enzymatic activity in the gluconeogenesis and glycogenolysis pathways and reduced secretion of glucagon, resulting in the occurrence of hypoglycemia. Therefore, timely correction of hypothermia is of great importance for newborns, especially for preterm infants.