Hiya - we have spoken before - so just adding a few thoughts for you
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Cot elevation can be very helpful. My DS has a cot wedge but he is also in a sleep pod thing so that he doesn't roll around. I find when he is well he sleeps quite peacefully, and when he is reflex he can be really fidgety. You can also use some types of sleepy positioners. Left lateral is a good reflux sleep position as well.
Secondly I wonder if he is reverse cycling his feeds a bit? So full up from the nights that he is less interested in the day iyswim? It is a pretty common problem with a BF refluxed because they do tend to feed better at night, and do tend to end up nursing for comfort as well. I have BF 2 refluxers, but my current one is bottle fed, and I find that I can settle him elevated on my chest. I am pretty sure that would never have worked for one of my BF babies - but my DS2 does only tend to want a feed when genuinely hungry. That said - it is pretty recent that he is getting to 4hrly feeds at 7 months now.
If your LO brings up a lot of milk (mine does as well - he literally pukes from the end of one feed to the start of the next one 4 hrs later) have you considered a type of thickener to see if that would help? Or indeed starting solids at this age as it has a similar effect. Again it could help with the choking episodes.
I do find that medical approaches can be quite different between the UK and US. I'm seeing my paed next week and I am almost certain that he will tell me to carry on yk?
CIO is not the answer, but I do think it is pretty likely you have a feed to sleep association at this point
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My DS drinks lower volume feeds - he has about 5oz - I have often felt frustrated and got him to take a 7 oz bottle at bedtime. It never helps, just makes it worse and makes him restless as he refluxes more.
Stretching feeds to 2.5 hrs really shouldn't be a major issue at this age though (in that he should be able to do 2.5hr feedings). Do you think it will be hard to get there??
It really is a big old reflux/ breast feeding pickle isn't it?? I have been there twice before and it isn't nice, I know. With my DS1 I found he was better being bottle fed, and we slowly moved over as he approached 7 months. I did get past it the second time when I was clearer that it was reflux and had her on proper meds from early on.