Size NewBorn Blue Never used just washed Swaddle UP Helps Baby Self-Soothe: The unique, award winning ARMS UP design of our sleep sack allows natural arms-up sleep, aiding self-soothing for longer sleep. 83% of parents reported an increase in hours slept by their baby when using Swaddle Up Hip Healthy Sleep Sack: Our sleep sacks are super soft and stretchy. The baby swaddle Up offers ample space for hip and leg movement, promoting natural development of the hip joint. Recognized by the International Hip Dysplasia Institute Easy & Safe Sleep: Our Love to Dream Swaddle Up is a safer alternative to a baby blanket. The two-way zipper makes diaper changes a breeze, even in the middle of the night. This baby essentials Swaddle Up makes great baby shower gifts