A sleep sack is a wearable blanket designed for infants and toddlers to keep them warm and safe while sleeping. Unlike traditional blankets, sleep sacks have armholes and a zipper or snap closure, allowing babies to move their legs freely while preventing them from getting tangled or covered by loose fabric. They come in various materials and thicknesses to suit different temperatures. Sleep sacks are often recommended by pediatricians as a safer alternative to blankets, reducing the risk of SIDS (Sudden Infant Death Syndrome). They are available in various sizes and styles, making it easy for parents to find the right fit for their child. Many sleep sacks also feature fun designs and colors, adding a playful touch to bedtime.