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This easy transition sleep sac is designed for babies who no longer like to be swaddled but still need help controlling the startle reflex. It's made of lightly quilted 100% cotton with sleeves and 4-way stretch providing a snug, comforting fit without overheating. It's roomy sack allows room for kicking and promotes healthy hip development. The 2 way zipper, with tabs at both the top and bottom, allows for easy dressing as well as diaper changing. "Back is Best" reminds all caregivers to put baby to sleep on thier back. TOG 1.5; size small fits 13-20 lbs, size medium fits 19-24 lbs.