A sleep sack, also known as a wearable blanket, is a cozy and safe alternative to traditional blankets for babies. If you're looking for synonyms for the word "sleep sack," some options include swaddle, sleeping bag, sleep suit, infant sleeping sack, or baby sleep sack. Each of these alternatives offers a similar function to the sleep sack, providing a comfortable and snug sleeping environment for young children. Swaddles are especially good for newborns, while sleep suits and bags are available in various sizes to fit growing babies and toddlers. Whichever option you choose, rest assured that your little one will be snuggled up safely and warmly.