Ok, first off. It will take a few days for her to get used to teh swaddle. So stick with it. It will make her angry, but it does help bigtime! Did you check out the aussie swaddle that is posted somewhere on the site here? It was the only swaddle I could get to work on my lo! Even at 7 months and highly mobile, he couldn't get out.
Your lo may be adjusting to the swaddle, the new routine and/or approaching a growth spurt. Hang in there. It's really quite tough to pin down exactly what it would be.
WHen you start something new, the lo may catch on and then regress for a few days. It's quite common and normal. So don't feel like last night was a failure. Just stick to waht you are doing. No need to chnage it all around just because of one night.
I think if you are worried about the gas, try some gripe water. Many ppl sing the praise of this wonder liquid.
Hang in there and wait it out a bit to see.
{{hugs}}