Sounds like you may have a "happy chucker" - these bubs have reflux, but aren't bothered by it.

To help the little guy out, try to elevate the head of his bed. This way the acids in his stomach have to work against gravity. Also try to keep him upright after a feed for about 20mins.

If he's not bothered by it Drs generally won't do much as far as I know, but if he's uncomfortable or losing weight they may put him on medication.