How old is he???
How long has this been an issue???
Have you talked to a GI abou tthis issue????
All these factor in on what to do, sorry…:-(
If it has been an issue for a long time I would talk to the GI and see about an X-ray to see if there is an obstruction issue going on.
If not you can make sure he is well hydrated and possibly add in some prune or apple juice. If reflux is an issue like you said I’d do Prune juce.
Hydration is a big help in making sure the bowels move properly.
Other than that you amy just have to se an OTC laxitive to help. Once you get a good bowel regimin going then the poing will go better and you just may see the reflux subside some.
You know when the GI tract backs up reflux gets worse, sadly.