Ergonomic for Newborn Growth - Certified as a hip-healthy product by the International Hip Dysplasia Institute (IHDI), the KeaBabies Soothe Baby Swaddle Sack provides ergonomic hip support for an infant's first 6 months of growth. Breathable & Temperature-regulating - Our Soothe Swaddle for newborns is made with ultra-soft Organic Cotton (GOTS Certified by CU 1042833), it is lightweight and highly breathable which makes it a highly-raved newborn swaddle sack for all seasons. Baby-Safe for Sleeping - Our newborn swaddle is certified to be safe for use as a baby swaddle blanket. We use soft and durable hook-and-loops, which are highly functional yet gentle on the baby's skin. An ideal newborn sleep sack for safe sleeping. Smart Design for Restful Sleep Swaddling with a swaddle blanket is made simple in just 4 steps with our baby sleep sack. Designed to create a snug and soothing womb-like environment for newborns and infants. A must-have newborn essential. Durable and Lasting - The FabTech 2-way stretch knit makes the Soothe Baby Swaddle Sack extra durable, machine washable, and lasting. This proprietary knit allows your baby to enjoy a comfortable and calming swaddling experience.