The Cocoon Swaddle Sack is a zip-up swaddle used to sleep a baby in from birth. TOG rated for warmth, the Cocoon Swaddle Sack keeps a baby safe and securely swaddled without the need for complicated wrapping. Being TOG-rated ensures its insulated enough to use in room temperatures between 57-66°F with no blankets required in the bassinet or crib, making this a safe sleep option for a newborn or infant baby. The chest area is 1.0 TOG rated to prevent overheating and allow for full chest expansion when breathing. Parents can layer up underneath as needed for warmth, and follow our handy FREE room thermometer and What To Wear Guide included with the product to help them dress their child appropriately. We recommend pairing this with one of our TOG-rated Rompers underneath (sold separately). The Cocoon Swaddle Sack features arm poppers at the shoulders, to transition the Cocoon from an arms-in swaddle to arms-out sleep sack when baby is showing signs of rolling. A zip enclosure protects your child's delicate skin, and the soft, breathable natural fibers are certified non-toxic, dyed with water based dyes, and gentle on newborn skin, and skin prone to eczema breakouts. The swaddle is made from and filled with GOTS certified organic cotton, with elastane in the outer fabric and bamboo in the lining. This means it's firm enough to restrict startle reflex whilst still allowing stretch and movement for healthy growth. Lightly worn! Size 0-3M