患儿男，15天，因频繁呕吐8天入院。G1P1孕38周顺产，无窒息，出生体重3000克。父母非近亲婚配，母孕4周时曾有“感冒”未服药物治疗。生后第8天始呕吐，多发生于吃奶后十分钟至三十分钟左右，呕吐物为乳汁及乳凝块，不含胆汁。入院前一天出现咳嗽及口吐白沫，病程中，无发热腹 Children male, 15 days, due to frequent vomiting admitted to hospital for 8 days. G1P1 38 weeks of pregnancy, no asphyxia, birth weight 3000 grams. Parents of non-relatives of marriage, mother had 4 weeks when there was a “cold” is not taking medication. After the first eight days after birth, vomiting, occurred in 10 to 30 minutes after feeding, vomit milk and milk clot, without bile. The day before admission cough and foaming at the mouth, the course of the disease, no hot belly