Infants sleeping on their sides will not affect growth and development, but babies should sleep in several sleeping positions alternately, giving the baby a proper change of position, such as supine, lateral, or even prone position. But the prone position should pay attention to the baby’s head should be tilted to the side, to ensure that the baby’s airway is open, the mouth and nose near the foreign body, so as not to block the baby’s mouth and nose and affect breathing. Side sleeping and sleeping in the supine position are safer and will not affect the baby’s growth and development. In addition, the baby’s sleep environment should be kept quiet, appropriately dark, the temperature in the house is best kept at 22 ℃ – 25 ℃, humidity is maintained at 50% – 60%, so that the baby can have a restful sleep.