First aid CPR for infants usually follows the process of chest compressions, opening the airway and establishing breathing, as follows: 1. Chest compressions: infant chest compressions are usually performed with two thumbs in a circular embrace method, the finger and the middle finger side by side compression method, the compression site is in the lower 1/3 of the sternum, the compression frequency is 100~120 times per minute, the depth of infant compression is about 4cm, to ensure that the chest is fully rebound and minimize the interruptions. 2. Open the airway: clean up oral, pharyngeal and nasal secretions, foreign objects or vomit, and keep the child’s airway open. Open the airway by tilting the head and lifting the chin. Be careful not to close the mouth or push the soft tissue under the jaw to prevent airway obstruction. 3. Establishment of breathing: artificial respiration is suitable for on-site first aid, i.e., the operator first inhales deeply, small infants can cover their mouths and noses with their mouths; larger infants can be sealed mouth-to-mouth with the thumb and finger pinched tightly against the child’s nose, keeping the head tilted back; blowing the air in, and at the same time, the thorax can be seen to be lifted up. After stopping the blowing, release the nostrils and allow the child to exhale naturally, expelling the gas from the lungs. It is important to note that all trained non-medical personnel should perform at least chest compressions during infant CPR, and if they are able to perform artificial respiration, they should do so at a rate of 30:2 chest compressions:artificial respiration.