Patented Arms UP design replicates your baby’s natural sleeping position, allowing them to self-soothe and preventing the startle reflex , Double zip makes nappy changes easy without having to remove the swaddle , Hip-healthy design does not restrict your baby’s legs, allowing them to lie in a natural position , 1.0TOG the Original Swaddle is made from 93% cotton and 7% Elastane for snug comfort Designed for babies , approximately 1-3 months, 3.5kg-6kg or up to 25in long ,