Babies choking on food into the trachea, if the choked food is relatively small cases, without causing obstruction of the respiratory tract, usually early will be manifested as an irritating cough, and this cough is not relieved by drinking water or patting the back. If the food cannot be coughed up by itself and remains inside the trachea for a long time, there is a gradual risk of bacterial infection in it. In the middle and late stages, lung infection will occur, coughing and coughing up sputum, and in severe cases, pneumonia leading to breathing difficulties. If the choked food is relatively large, early on there will be immediate symptoms of respiratory obstruction, in addition to an irritating cough, there will be difficulty breathing, and even cyanosis of the lips or the skin of the whole body. If this happens, it should be treated immediately with the Heimlich maneuver.