An understanding of gastroesophageal reflux disease in infants and children by the clinician requires a working knowledge of 18- to 24-hour esophageal pH monitoring and the motility disorders of the esophagus and stomach that may be associated with gastroesophageal reflux disease. The results of surgical therapy for childhood gastroesophageal reflux disease cannot be assessed accurately without this knowledge. Antireflux operations can be tailored to the child's situation, which includes a combination of clinical symptoms and findings on objective tests for reflux and associated alimentary-tract motility disorders. The presence of severe complications from gastroesophageal reflux disease in "asymptomatic" infants and children is a troublesome and not yet fully defined problem. Special areas include the documentation of gastroesophageal reflux disease as a cause of SIDS, the increased reporting of Barrett's esophagus and adenocarcinoma of the esophagus in childhood, and the effect of associated alimentary-tract motility disorders in children with CNS disease who have gastroesophageal reflux disease requiring surgical intervention.