How to Safely Swaddle a Baby UC Davis Children's Hospital Amazon.com: Transition Baby Swaddle 3 6 Months 12 18 lb, Arms In Out Baby in a swaddle ELIZABETH STREAM fashion Swaddling for Baby Comfort and Sleep. This swaddle blanket is beyond perfect for any sweet baby on the way. Made out of a super soft stretchy knit. Matching knot hat fits newborns, and is available in the drop down of the listing. The fabric we used is super stretchy, made from bamboo viscose, wait until you feel how soft it is! Swaddle blanket is 47" X 47" perfect for light weight swaddling, stroller blanket, and nursing cover! Pattern of the blanket is only on one side, beautifully finished around the edges for the perfect professional look! 95% Viscose from Bamboo, 5% Spandex