Symptoms and auxiliary tests can be used to determine whether an infant has gastric reflux. 1. Symptoms: Gastric reflux will irritate the mouth and throat, and the patient will experience nausea, dry vomiting, hoarseness, throat discomfort, difficulty in swallowing and other adverse reactions. In addition, it will also affect normal breathing, the patient appears to vomit, crying and restlessness, in its vomit, you can smell the obvious acidic odor. If the symptoms continue to recur, it will affect the normal growth and development of the patient. 2. Auxiliary examination: you can go to the hospital for subesophageal PH monitoring, esophageal manometry, dynamic observation of esophageal function, and if there are more than 3 times of reflux within 5 minutes of barium esophageal meal contrast, then it may be gastric reflux. If patients experience discomfort, they should seek immediate medical attention for a definitive diagnosis.