When a newborn is in the mother’s womb, the ambient temperature is high and drops rapidly once the baby is delivered. It will slowly return to a normal body temperature after 12 to 24 hours. Under normal circumstances, the axillary temperature of a newborn baby is between 36 and 37 degrees Celsius, once it exceeds 37.4 degrees Celsius, it is considered feverish. The baby’s body temperature between 37.4 – 38.0 degrees Celsius belongs to the low fever stage, 38 – 39 degrees Celsius belongs to the moderate fever, once more than 39 degrees Celsius belongs to the high fever state. Another characteristic of a newborn baby is that his thermoregulatory center is still underdeveloped and in an unstable condition. When the ambient temperature is relatively high, the baby’s body temperature will be in a relatively high state, if the ambient temperature is low, the baby’s body temperature will also be reduced with the environment. So the baby in the newborn stage, for the baby’s care, must be given a suitable room temperature environment. When taking the temperature, you should also pay attention to avoid the influence of environmental factors.