Patented Arms UP design replicates your baby’s natural sleeping position, allowing them to self-soothe and helps to reduce the startle reflex Hip-healthy design does not restrict your baby’s legs or hips, allowing them to lie in a natural position 0.2 TOG and 30% lighter than the original, ideal for warmer summer nights Made from luxuriously soft bamboo fabric Designed for babies 3-6 months, 6kg-8.5kg or up to 27in long The Swaddle UP can be used from birth and has proven to help your baby sleep better and for longer. The snug fabric provides the cosy, swaddled feeling that babies love, while the "wings" design maintains baby`s natural and preferred "arms up" sleeping position. Babies can suck their hands through the fabric of the Swaddle UP, allowing them to self-soothe and they can’t scratch their face. The double zip makes it quick simple for you to change your child's nappy, eliminating the need to remove your little one from their swaddle.