Well... there may be a reason not to leave him on it long term. My son was on Zantac too, but not starting until he was around 17 months old. I was told it was just an acid neutralizer, but it turns out (according to a couple of different sources - somewhere online and my gf who's an RN and looked it up for me) it's actually a pump inhibitor, reducing the amount of acid that their bellies produce initially, but then as they continue to take it, their bodies override that and start making extra acid to make up for the pumps that are inhibited, causing an increase in the reflux. My doctor at the time (who I loved and very much believe had my son's best interests at heart) told me it was just a neutralizer, but she was wrong. They can't be right all the time.
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It sounds like it's mostly helping you ladies' babies at this point, but I believe it wasn't meant to be taken for more than 8 weeks at a time, before the "override" sort of kicks in? For a few reasons, we would take my ds off of it, and he would actually improve for awhile, and then start to get worse again. So then we'd try it again and he would initially improve, only to have it worsen after a couple of months. Took me awhile to figure out what was going on.
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Then after a couple of years of struggling with all of this, we had blood tests done to check for food sensitivities, (through a naturopath - the allopathic med community didn't even suggest this type of thing for him) and he had 17 or so foods he needed to avoid totally (the usual dairy, wheat, soy, and some other crazy things like rice and bananas!) and we had to start a rotation diet (totally different foods every single day, on an at least 3-4 day rotation) for him. I think now that he had and has (he's 8.5) the eosinophilic esophagitis that causes chronic inflammation in his digestive system, and that he never actually had GERD. That also explains how it was something he developed over time, whereas GERD is frequently an issue of sphincter immaturity in newborns - but not always of course. I'm not saying your babies have that - it's just how things turned out for us. WHEN we we're able to keep him on his diet, his immune system is just bullet-proof, and he doesn't spit up or burp up anything. It's just an ongoing challenge as he gets older, and the rotation is KEY, or he develops new sensitivities, just as he loses old ones when given enough of a break from those foods. (He can eat rice and bananas again now, but no milk - yogurt and cheese is ok, and no wheat or eggs. Gluten is fine for him, just not wheat gluten.)
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Basically something to keep an eye on long-term, of course I'm not a doctor and don't mean to advise you per se, just thought you'd possibly benefit from our experience! Hope things continue to improve for your little ones!