Swaddle blankets are made of lightweight fabric like cotton muslin that is wonderful for helping to regulate an infant’s body temperature in contrast to thicker baby blankets on the market. Since cotton muslin uses a smaller weave pattern, it also allows for a much better stretch in the fabric to obtain that additional secure swaddle. Swaddle blankets are also often large (ie. 47”x47”). So with extra size and fabric you can properly wrap up your baby.