Pyloric stenosis, also known as infantile hypertrophic pyloric stenosis, is a rare condition that makes the valve between a newborn's stomach and small intestine get thick and swollen. This blocks ...

Infantile hypertrophic pyloric stenosis (IHPS) is a common condition in neonates that is characterized by an acquired narrowing of the pylorus. The aetiology of isolated IHPS is still largely unknown.

This is called pyloric stenosis. This thickening can become so large that it blocks the flow of food from the stomach to the small intestine. Pyloric stenosis is most likely to affect young babies.