My 2 month old baby was constantly struggling against swaddles (and breaking free), so we opted to put him in sleep sacks instead. I wanted something that would last a while and that was good for all year long. I'm impressed with the quality, and while it is still fairly large on my 2m old, I don't have to worry about it going over his face or being of any danger. It's been brutally humid and warm here this summer, and we do not have AC, so it's been a bit too warm on some nights, but otherwise...
4 Season Ultimate Baby Sleep Bag, Merino Wool, 2 Months - 2 Years, Night Sky