Esophageal reflux cough in children can be diagnosed by clinical symptoms, ultrasound, gastroscopy, 24-hour reflux monitoring and other methods. 1. Clinical symptoms: children’s cough is often caused by reflux of gastric contents, mostly manifested as choking cough, accompanied by acid reflux, heartburn and other symptoms. Coughing may be aggravated at night when the reflux is aggravated by lying down. 2. Abdominal ultrasound: for younger babies, gastrointestinal ultrasound can be perfected just after breastfeeding, which can determine whether gastroesophageal reflux exists to a certain extent. 3. Gastroscopy: Gastroscopy may reveal damage erosion of the esophageal and gastric mucosa. It can further diagnose reflux esophagitis. 4. 24-hour esophageal PH monitoring: Diagnosis of GERD can be confirmed by 24-hour monitoring of the PH value in the esophagus. Through the above measures, it is possible to determine the reflux cough in children. Once diagnosed, it is necessary to actively cooperate with doctors to receive standardized treatment to improve symptoms and promote recovery.