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Pyloric stenosis is a congenital defect in which the opening of the pylorus is too narrow. Food is thus unable to pass into the duodenum. Children with pyloric stenosis usually manifest forceful, "projectile" vomiting within the first 1 to 2 weeks of life.
Review Date 8/5/2023
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
