Who is affected by pyloric stenosis

Pyloric stenosis occurs in 1 to 3 out of 1,000 babies.1 It develops most often in those babies who:2

  • Have family members who had pyloric stenosis. About 13 out of 100 babies with pyloric stenosis have a close family member who had the condition.
  • Are male. Males are affected 4 times more often than females.


  1. Wyllie R (2007). Pyloric stenosis and congenital anomalies of the stomach. In RM Kliegman et al., eds., Nelson Textbook of Pediatrics, 18th ed., pp. 1555–1558. Philadelphia: Saunders Elsevier.
  2. Sondheimer JM, Sundaram S (2009). Pyloric stenosis section of Gastrointestinal tract. In WW Hay Jr et al., eds., Current Diagnosis and Treatment: Pediatrics, 19th ed., pp. 580–581. New York: McGraw-Hill.

Last Updated: December 20, 2009

Author: Debby Golonka, MPH

Medical Review: Susan C. Kim, MD - Pediatrics & Brad W. Warner, MD - Pediatric Surgery

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