When I had to stop swaddling my baby, we immediately went into the Halo Sleepsack.  It's great - it zips up from the bottom which allows easy diaper changes and it keeps him warm at night.  He can't kick it off like he would if he were using just a regular blanket.  I want one for myself!  It is kind of difficult to get his arms in and out of, but that's a small price to pay.  Plus, he looks so cute in it when I get him in the morning.  It doesn't prevent him from moving around in his crib, either, which is good.  He doesn't seem to mind the fact that his legs are stuck in a bag-like item....