The gently weighted Zen Sleep Sack helps your baby sleep through every sleep phase. Designed to help babies self-soothe and fall asleep independently, the Zen Sack eases the transition from swaddle to sack, and prevents sleep regressions and disruptions: An essential for sleep training. ▪ Two-way zipper makes diaper changes a breeze ▪ Zipper covers, cuddly seams and soft tags protect your baby’s skin ▪ Can be worn backwards by tummy sleepers who can roll independently ▪ Grow-with me adjustable snaps Used less than 5 times.