Through the following methods can determine whether the infant swallowed a foreign body: 1, the infant’s contact history of foreign objects, generally in the swallowing of foreign objects before there is contact with a foreign body and part of the foreign body is missing, infants often take a foreign body into the mouth to plug the situation. 2, there will be a sudden crying, coughing, dry retching and other uncomfortable symptoms, often a foreign body stuck in the throat or esophagus, resulting in pain and other discomfort triggered by the. 3, by means of filming and other To check whether the foreign body is swallowed and the location of the foreign body by means of film etc. 4. Observe the stool to determine whether the foreign body is swallowed or not, generally after swallowing the foreign body will cause gastrointestinal irritation, and there will be blood and pus in the stool and so on. In addition, some foreign objects are smooth and not easy to be digested, can be discharged with the feces in about 2 days after swallowing the foreign object, if you can find foreign objects in the feces, you can infer that the baby has swallowed a foreign object.