My LO has always had gas, but today it was so painful for her and she didn't sleep at all unless she was in my arms, so not a good day for us here. I was using the nursers with drop ins and actually I think that is a big problem as the liners weren't collapsing and she was taking too much air in. So we are using the Ventaire, Dr. Brown's, Similac Simply Smart and Nuk bottles. the Similac and Nuk have a hole at the top to let out some of the air and I know that many people swear by Dr. Brown's. I also gave her gas relief drops and burped her a lot today. I also had her sitting up as I was feeding her and had her sitting up for awhile after feeding. I, too, have gone to the Sensitive formula and that worked out better last week when we started it, so I decided it was time to change up the bottles instead.
She is now sleeping in her bassinet on her back, so I think the gas isn't as painful.