Don't get me started on blankets! DS is turning 3 & still refuses to have a blanket on!
I just used to make sure he was dressed warm for bed, so he didn't need it. Sleeping bag dressing gowns are good. I got mine from Best & Less. Not Gro Bags. These ones are fleecy & have sleeves, then zip at the bottom. One of ours actually had a little slit between the legs for pram/car seat harness! It was well used by us. I have one for Summer. Need more, I think I gave DS's away.