If a child chokes on water, the amount of water that enters the trachea is small, and it is usually possible to cough up the water by patting his back and promoting coughing. However, if the amount of water drunk is large, or if oral food or other foreign objects are choking the trachea, the Heimlich maneuver must be applied. If it is an older child, you can stand behind the child and press the patient’s upper abdomen with the interosseous muscle of one hand, then overlap the other hand on top of the first hand and forcefully impact the upper abdomen inwardly and upwardly. This will cause a pressure in the chest cavity and an outward impact on the trachea, which will dislodge foreign bodies or large amounts of water from the obstructed airway into the mouth, thus relieving the obstruction of the airway. In the case of very small infants, usually less than one year old, one hand can be placed on the infant’s chest and slapped five times, then the infant is made to lie down, taking care that the head must be lower than the chest and abdomen, and then the infant’s back is slapped five times. This also has the above effect of constricting the chest cavity and inducing the expulsion of foreign bodies from the obstructed airway.