Okay, so you've established that baby has reflux.......
Well, are you doing the following?
A) making sure that baby stays upright for at least 30 minutes after feeding, and I mean UPRIGHT, as in nearly sitting up or at a pretty good angle.
B) making sure that you burp that baby for all he/she is worth.
C) you need to prop the bassinett as well. they make some foam wedges for smaller areas, you could try that in the bassinette. I just let my babe sleep elevated on my forearm in the bed.
D) have you discussed with your pedi the tummy sleeping issue?
E) are you BF'ing? if you are, try nursing on one boob only at each feeding (you will end up having to feed more frequently, BUT you probably won't have as much spit up).
F) If you are having such problems with the zantac ask your pedi if there is another medication, we had to switch to prilosec. Some meds just work better for some babes.
G) Try an elimation diet. Try eliminating dairy for two weeks and see what happens. Then move on to soy, wheat and eggs. (I was dairy wheat soy and egg free for 7 months,and we JUST started to reintroduce eggs and it seems to be going okay).
H) If you're FF try one of those crazy expensive formulas that is hypoallergenic, alimentum or nutrimagen or something? I don't know, I don't formula feed but that sounds about right.
Good luck........these things worked wonders for my babe! HTH
Wife, and mother to a small fairy, a demolition expert, a special new someone this fall and a small dachshund.