Pyloric Stenosis Symptoms. Signs of pyloric stenosis usually show up when a baby is 3 to 5 weeks old. Babies who have it don't look sick, but they throw up a lot.

Pyloric stenosis is rare — in the U.S., it’s seen in only three out of 1000 newborns. Also, it’s a curable condition that can be easily diagnosed and fixed with minimally invasive surgery ...