There are two basic types of swaddles, traditional and two-in-ones. A traditional swaddle blanket is a large, thin blanket, usually made of a soft, stretchy fabric like muslin, cotton or bamboo. Two-in-one swaddles let you wrap your little one snugly or leave their arms out. They often come with features like snaps, zippers or Velcro that help make swaddling easier and ensure the swaddle stays secure. A sleep sack is like a mini sleeping bag for your baby and toddler. Sometimes also called a wearable blanket, a sleep sack is another alternative for keeping your little one warm without using loose blankets in the crib. Sleep sacks are usually made of cotton, fleece or wool and feature zippers and snaps for easy on and off. Many parents choose to transition their little ones to a sleep sack once the swaddle days are behind them. It’s meant to be worn over pajamas and is a great choice for keeping older babies warm without putting a blanket in the crib. Read more about appropriate swaddle and sleep sack use for your baby.