The Baby Merlins Magic Sleepsuit is a sleeping sack designed for babies aged 3-6 months and weighing between 12-18 lbs. Made by the trusted brand Baby Merlins, this sleepsack is perfect for keeping your little one snug and secure while they sleep. The magic sleepsuit provides a cozy environment that can help your baby feel safe and secure, promoting better sleep for both you and your little one.