Designed for babies with existing Hip Dysplasia. With a wider fit to be worn over Hip Dysplasia harness or brace Featuring unique zip off wings to make transitioning easy, simply remove one wing at a time 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 Designed for babies up to 6 months, 8.5kg-11kg or up to 29.5in long Created especially for babies with existing Hip Dysplasia (for use with a Pavlik Harness, Denis Browne Bar (DDB) and Rhino Brace). Designed with a wider fit at the bottom to be worn over a Hip Dysplasia harness or brace, providing an easier and gentler way to graduate from swaddling.Transitional swaddle, The 50/50 swaddle makes it easy to move from a traditional swaddle to sleeping bags. Simply zip off the removeable wings one arm at a time. Natural Position, The Swaddle UP 50/50 design has been based on your childs natural arms up sleeping position, which allows them to self soothe in the night. Hassle Free, the zip makes it easy for you to put your child into the Swaddle. No technique learning or practicing is needed unlike traditional swaddles. Easy Nappy Changes, the dual zip makes it simple for you to change your childs nappy whilst not removing the swaddle completely.