A.R.
A chiropractor will fix this K.. He most likely has a hiatal hernia, which is very common and easily resolved.
A hiatal hernia means that a part of the stomach is pushing up against the sphincter between the stomach and the esophagus - the 'hernia' part comes from the fact that it "bubbles" up into the tube, resembling a hernia. Most hernias are more dangerous.
This type, however, is very common - even adults have it. As a matter of fact, it is estimated that over half of reported "acid reflux" cases in the US are caused from hiatal hernia's, which are more easily resolved with a simple manipulation that anyone can learn than from pharmaceuticals.
So, go to a local chiropractor and ask them about the possibility that you son has a hiatal hernia. You will most likely feel better in less than a heart beat.