D.L.
My son was a finicky eater for a while on baby foods. I moved him onto table foods when that happened. His pediatrician said to try a large variety and then stick with what works for about a week or before adding something new. My son doesn't have reflux but he has eczema brought on by food allergies. We got him tested and found out that, although we had been told just about everything was an allergen, he was only allergic to eggs and strawberries. I read labels carefully and use a lot of produce when feeding him. All foods are required to post on the packaging about any allergens contained in the food. (this has been a big help for me)
Another side note, some medications start to affect appetite. After my son switched meds, his appetite was better. We also became careful of what time we gave him his meds. This helped too. His pediatrician may have some more suggestions. Good Luck.