The 10 Best Sleep Sacks You Can Find on Amazon

SleepingBaby Zipadee-Zip Transition Swaddle ($40)

The Zipadee-Zip transition swaddle is safe for rollers and provides a unique starfish design. "Our child transitioned to these effortlessly and actually began sleeping through the night within a week or so," one reviewer said. "It's been a week since then, and he hasn't woken up crying in the night, not even once. It's made me wonder if this would have helped our first child sleep through the night, so my only regret is not buying these years ago."

Worth noting: some reviewers flagged that the zipper can get bunched up by a child's mouth and that the material pills easily.