Gastroesophageal Reflux in Infants (Gastroesophageal Reflux Disease [GERD]) By William J Cochran, MD, Geisinger Clinic Reviewed / Revised Aug 2021 | Modified Sep 2022 View Patient Education Etiology Symptoms and Signs Diagnosis Treatment Key Points More Information Gastroesophageal reflux is the movement of gastric contents into the esophagus.