We gave up on the sleep sack and just have him in fleece footie pajamas. I wanted to get a larger sleep sack but DH vetoed it.
Yeah. I don't really understand the point of a sleep sack for a baby over 12 months of age? The point of them younger than that is to reduce SIDS risk, but after that I guess i figure I just dress my little guy in layers if it is cold in his room (which it is in WI in the winter), and cover him with a blanket. He's been fine even if the blanket is off. I wouldn't waste my money on sleep sacks at this point, but that's just me.