Natural air is generally not recommended for newborn babies. As the outside temperature is significantly lower than the temperature inside the mother’s womb after the baby is born, it is recommended that strict attention be paid to keeping the baby warm. It is recommended that the room temperature be maintained at 22 to 24 degrees Celsius, and the appropriate ambient humidity is 50% to 60%. It is generally not recommended that newborn babies be exposed to natural air directly. Parents can open the windows to ventilate the room when the baby is not in the room, and air purification equipment can be applied if possible. Premature babies or hypothermia should be placed in a warm box, and the neutral ambient temperature should be selected according to the gestational age, birth weight, and postnatal day age. Other warming measures, such as wrapping the newborn in a preheated blanket, may be applied if unconditioned. Newborns have a large head surface area and dissipate a lot of heat, so they should wear a flannel hat to keep warm during the cold season.