When a child swallows a foreign body by mistake, due to the different locations where the foreign body enters, such as the trachea and the digestive tract, the symptoms shown are different. 1. Into the trachea: when a foreign body enters the trachea through the vocal folds, there will be violent choking and coughing, and in some cases, there will be a short period of breath-holding and cyanosis at the same time; if the foreign body is embedded in the vocal folds, hoarseness and difficulty in breathing will occur; if a foreign body enters one side of the trachea, most of them will show up as paroxysmal coughing, and at the same time, there will also be wheezing sounds. 2. Esophageal foreign body: after a child swallows a foreign body into the esophagus, if it becomes embedded, the child will have difficulty swallowing, repeatedly do swallowing, accompanied by nausea and vomiting; if the object is large in size, the child will cry due to pain. Once found that the child accidentally swallowed a foreign body immediately using the Heimlich maneuver, if it is less than 3 years of age, let the baby’s head below the torso face down on the parent’s thighs, in the back of the beat 1 ~ 5 times; then let the baby lying on his back in the parent’s lap, with the middle finger and the finger placed on the baby’s chest and umbilicus on the abdomen, rapid upward pressure 1 ~ 5 times until the foreign body flushed out until. For children older than 3 years old, parents hold the child from behind, make a fist with one hand and hold it against the baby’s upper abdomen, press the palm of the other hand on the fist, and press both arms upward and inward tightly, and rhythmically tighten and loosen until the foreign body is flushed out. Perform the above operation at the same time call the emergency center 120 for help, cooperate with the physician to deal with.