Jesse was a September baby but it was still very cold. I too liked the snuggling factor!
You can always put bubs in a sleeping bag as others have suggested, but by the time bubs is rolling it will be warmer. Jesse was in sheets and blankets for the first few months until he started pulling them over his head to get to sleep.. then we switched to grobags. But if you just wrap him/her snug theyll still be too young to pull blankets over their head during the winter anyways. I dont think youll have much problems