I had surgery for pyloric stenosis as an infant. i'm 40 now and can feel food moving through that part of my stomach. do i need surgery again?

Not necessarily...: Most likely not; you are probably experiencing some increased motility from what you ate. Scar tissue forms after any major surgery; but as your procedure was so long ago i would say no. If you experience any vomiting of blood or undigested food, change in bowel habit, or change in bowel habit then i would suggest a visit to the primary care doc; and possibly a GI consult.

Unlikely: By age 40 if there were serious obstruction or malfunction with your pylorus it would have been manifest a long time ago. That is assuming that you can eat and not vomit and have no symptoms of indigestion, reflux or other symptoms like irritable bowel syndrome.