Pyloric stenosis is a
problem with a baby's stomach that causes forceful vomiting. It happens when
the baby's pylorus, which connects the stomach and the small intestine, swells
and thickens. This can keep food from moving into the
A baby may get pyloric
stenosis anytime between birth and 5 months of age. Boys are more likely than girls to get it. It usually starts about 3
weeks after birth. If your baby was born early (premature), symptoms may start
What causes pyloric stenosis?
Experts don't know what causes pyloric stenosis. It may be passed down through families.
What are the symptoms?
A baby with pyloric stenosis may:
Vomit soon after a
Have a full, swollen upper belly after a
Act fussy and hungry a lot of the time.
Have fewer and
harder stools than normal.
Pass less urine than normal.
starts gradually. As the pylorus becomes tighter, the
vomiting may become more frequent and more forceful.
Pyloric stenosis is treated
with surgery to widen the opening between the stomach and the small intestine. Surgery rarely causes problems, and almost
all babies recover completely. After surgery, your baby probably won't get
pyloric stenosis again.
Your baby likely will be ready to go home within 2 days after surgery. Being involved in your baby's care while he or she is in the hospital may help you feel more comfortable when you take your baby home. Talk with the doctor about how to feed your baby and what to expect. It's normal to feel nervous, but don't be afraid to hold and handle your baby.
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Semrin MG, Russo MA (2010). Anatomy, histology, embryology, and developmental anomalies of the stomach and duodenum. In M Feldman et al., eds., Sleisenger and Fordtran’s Gastrointestinal and Liver Disease, 9th ed., vol. 1, pp. 773–788. Philadelphia: Saunders.
Sundaram S, et al. (2011). Gastrointestinal tract. In WW Hay et al., eds., Current Diagnosis and Treatment: Pediatrics, 20th ed., pp. 595–630. New York: McGraw-Hill.
ByHealthwise Staff Primary Medical ReviewerJohn Pope, MD - Pediatrics Specialist Medical ReviewerBrad W. Warner, MD - Pediatric Surgery
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