I can understand your hesitation about testing, but sometimes it really is the only way to get the right answers. Regarding the barium test, is it a modified barium swallow or an upper GI. They are two different tests with two different purposes. Either way, you’d be surprised, but most babies don’t mind the taste of the barium. My dd also had a very severe feeding aversion and was pretty much on a feeding strike at the time of her upper GI. I was petrified that she wouldn’t drink it, but she sucked it back like she hadn’t eaten for days. As for the endoscopy, I’m a big fan… I asked for one at 6 months old, but b/c we’re in Canada, Hailey didn’t get it done until 15 months old, so she was a bit older. But I think it’s a pretty easy test, and can give a lot of good info. I’m not sure if your dd is on meds for her reflux or not, but if she is, then you might want to talk to your doctor about whether or not she should go off them, and how soon prior. If she’s not on meds, then you can get some really good info about whether or not she may need meds. Either way, you can look for esophagitis or EE or celiac or other good things to know. I don’t know too much about the pH probe b/c we never had it done. I’ve heard that the impedance probe is better and may be something to ask about. Good luck.