The normal body temperature in the axilla of a newborn baby is 36-37.2°C, but the normal body temperature of every baby is not absolute. It is related to the baby’s growth and development, living environment, wearing clothes and diet. So whether a one-month-old baby’s temperature of 37.4℃ is a fever needs to be analyzed on a case-by-case basis. Because the newborn’s thermoregulatory ability is not yet perfect, it is susceptible to many factors that can cause a slight increase in body temperature. Such as eating, excessive crying, activities or room temperature is too high and the clothing worn too thick can not be better heat dissipation, etc., can lead to infants and children’s body temperature of 37.4 ℃. Parents do not need to be too nervous at this time, it is recommended to measure the baby’s body temperature regularly, every half hour or an hour, and encourage the baby to drink more water. If the temperature decreases after changing the above factors, it can be determined that it is not considered a fever. If the above factors are excluded, and the baby’s temperature increases after regular measurements, and is accompanied by a lack of energy, the baby should be considered to have a fever and needs to be treated promptly to reduce the fever. The baby’s body temperature is too high or too low may be sick, so parents need to pay more attention to the baby’s body temperature. If the body temperature is below 38.5°C, physical cooling can help reduce the fever.