As some others have described here, the zipper is, unfortunately, the vulnerability of the sleeping bag. It takes a lot of tact, so the not come apart and at least as much sense to him together again when it's happening again.
Too bad, because the sleeping bag itself is great, the little one is sleeping very good at it and he is perfect for the winter. With a higher quality zipper - for which I would pay one euro more - it would be perfect!
