Size small fits 0-6 months 10-18lbs, 23-26” Helps transition from swaddle to wearable blanket #1 brand of hospitals nationwide Unique sleeve design helps control startle reflex Allows for easy diaper changes Scratch-free zipper coverings Premium fabric; no added chemicals 3 – 9 months Use over regular sleepwear Description When it’s time to transition from swaddles, this HALO® SleepSack® makes it an Easy Transition. Lightly quilted with protective sleeves in 4-way stretch cotton, it nestles baby like a soft blanket, without the risk of sleep-related dangers—so baby can sleep both comfortably and safely. Signature “Back is Best” embroidery is a gentle reminder to place baby in the recommended sleep position. Features an inverted zipper for easy diaper changes and a roomy sack design that’s recognized by the International Hip Dysplasia Institute as promoting healthy hip development.