1 MEDIUM SwaddleUp Original swaddle (13-18.5 lbs) Excellent condition, gently used. From pet-free and some-free home. 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 Lightweight Sleep Sack: Swaddle is made with a single layer of jersey fabric to reduce the risk of overheating. This 1.0 TOG baby sleep sack is ideal for MODERATE room temperatures between 68°F & 75°F.