Use over regular sleepwear to take the place of loose blankets100% cotton interlock. TOG: 0.5. Size small fits 10-18 lbs; size medium fits 16-24 lbs; size large fits 22-28 lbs; size extra large fits 26-36 lbsUnzips from the bottom for easy diaper changes. Generous sack design allows room for kicking, but cannot be kicked off so baby stays warm all night. Sleeveless design reduces the risk of overheating#1 Choice of hospitals. Used by hospitals nationwide for safe sleep education
