Pyloric stenosis is most likely to affect young babies. It’s found in 2 to 3 out of every 1,000 babies. It most often appears in the first 2 to 8 weeks of life, although it can occur in babies ...

An infant with pyloric stenosis will not pee or poop as often as usual because they are not digesting food normally. Dehydration may make them seem more sleepy than normal or lacking in energy.

Journal of Perinatology - Pyloric stenosis in a newborn baby with polycystic kidneys. ... In our patient the antenatal renal ultrasound was considered normal and the diagnosis was made after birth.