胃食管反流（GER）是一种小儿常见的症状，但有关婴儿GER自然过程的报道很少。研究的目的是确定婴儿生后一年内与GER有关症状的发生状况、消失的时间、评价父母报告的有关GER各种症状的发生状况和因GER而需要治疗的婴儿百分数．对象和方法在芝加哥三区（城区、郊区、半农村区） Gastroesophageal reflux (GER) is a common symptom in children, but there are few reports on the natural course of GER in infants. The purpose of the study was to determine the occurrence of GER-related symptoms within one year of birth, the time of disappearance, the parents’ reports on the incidence of various GER symptoms and the percentage of infants to be treated for GER. Objects and methods in three districts of Chicago (urban, suburban, semi-rural areas)