we still use a sleeping bag at night. my MIL made it out of fuzzy fleece with trucks and bought extra, so we can make it longer when needed. cost us a bit less than the grobags he's had since he was 4 months old.
ryan can actually get out of his, i think the buttons aren't as strong, but then i just stick him back in it when i go to bed. yesterday i went to bed and heard him whimpering half asleep saying that he's cold. well, don't get out of the bed then, i just say...
i really don't know what to do in the future. he just won't stay under a blanket...