Over my years of helping with CHERUBS, majority of gtube babies we do see they will eventually start eating on their own, but in their own time. It varies and each child is so different.

I don't have personal experience with the gtube. The swallow study is good to do, to check out things. Did they adjust his acid reflux meds as he gained weight? Have they tried different reflux meds to see how he responds. When a child relates eating to pain, they are not going to want to eat.

Some states have feeding therapy in addition to the speech therapy, something to ask about.