The clevamamareg 3 in 1 swaddle sleep bag is the perfect sleep blanket to help your baby have a peaceful nights sleep the removable wrap is interchangeable and grows with your baby made from 100 cotton it is guaranteed to be gentle on your babys soft skinmedical research suggests that babies will sleep better and longer if they are swaddledstage 1 allows you to completely swaddle your baby and help prevent startle reflex one of the main reasons your baby wakes during the nightstage 2