Hi K..
So sorry to hear about your LO's stomach issues. Sounds very similar to my experience with my LO (now 8 months old) - it's so hard to deal with when they don't feel good. He was gassy from the get-go (the hospital nursery ladies lovingly nicknamed him "stinky". I was breastfeeding for a while but he was having a bad reaction (regardless of me changing my diet) to it, so we switched to formula and it made a world of difference.
Devon has been on Alimentum (the "nicer" tasting of the two hypoallergenic formulas - be forewarned if you go there, it's not pleasant tasting/smelling - but it works) and it has been a godsend with treating his gassiness and acid reflux (silent: no spitting up, just acid going up and down his esophagus, real nice). He was intolerant of milk protein (and possibly soy, since it's almost all I drank while I was pregnant and nursing - I haven't yet tried it with him directly).
It's really good that you got off the Advance - that's the hardest formula out there for sensitive babes. Good Start formulas are made with partially hydrolyzed "comfort proteins" (gentle 100% whey protein that's broken down into smaller, easy-to-digest protein). They say that 100% whey partially hydrolyzed protein empties from babies' tummies faster than other routine formulas, which may help reduce the potential for spitting up. This might be a good bet for you if it's just gassiness. Similac also makes "Sensitive" - which might be one for you to check out too.
You definitely need to determine the cause - if it's just gassiness, you can go with one of the sensitive, broken down formulas. Devon was gassy, but he wasn't spitting up, he was screaming/crying almost all day every day, so we knew it was something besides just gas - he was in a lot of pain. Alimentum (and eventually, Prevacid - though he's been off that for a month and all good, thank god) has been our saving grace.
We use Born Free bottles that also seem to work really well (they have a venting system that removes bubbles/air) against gas.
We took Devon to a gastro when he was about 4 months old - and she determined it was more than just an immature digestive system/colic/whatever - so, it's not a bad thing to have an additional viewpoint. We had a sonogram done on his belly to make sure everything was alright in there. Totally painless - and glad we got it done.
A few other things you can do:
- keep her upright for about 15 mins after she drinks and really do try to make sure she burps once or twice after/during each feeding.
- "bike" her legs to get some gas out
- prop her mattress so she isn't lying totally flat
- if trying new formulas, make sure to make the switch a mostly gradual thing so you can see what kind of reaction she has to the new one and so she has a chance to get used to it. Unless she's having such a bad reaction to one type that you just need to make a full-on switch altogether. That gradual thing (1 oz of new to 4-5 oz of old/bottle) is more for when she's been on something that works and you're ready to try a less senstive/more milk-like product.
Hang in there and take it one day at a time.
Good luck!!!
M.