Aden + anais warms up the tradition of muslin with our cozy sleeping bag. Perfect for cooler nights or air-conditioned nurseries, the four layers of 100-Percent cotton muslin makes this a must-have to keep baby comfy and cozy, all year round. Available in a variety of sizes, it's the perfect infant sleeping bag for babies who have outgrown swaddling or for toddlers to drift off into a cozy slumber.