S.R.
I have a 2 yr old and she is really gassy too, I think the milk has something to do with it but I have come to the conclusion that while they are sleeping it's harder for them to release the gas because of the horizontal position and lack of movement. During the day their running and playing and it's easier to work itself out. I think I would probably try giving her Mommy's Bliss Gripe Water before she takes a nap, I love that stuff works great on my kids and it all natural!