Size: small Unique patented wings allow natural ARMS UP™ position ARMS UP™ allows true SELF-SOOTHING™ = more sleep Swaddle in seconds with no breakouts Twin zipper for easy diaper changes No loose layers to kick off during sleep Acknowledged as a hip-healthy product by the International Hip Dysplasia Institute; design allows the recommended flexion for hips & legs This Light Weight Material is ideal for room temperatures between 68°F & 75°F Organic fabric is ideal for baby's delicate skin Single layer of fabric to reduce risk of overheating All our garments are quality and performance tested Easy care: machine washable & tumble dryer friendly Fabric content: 95% Organic Cotton, 5% Elastane Smoke free dog friendly home