The HALO SleepSack wearable blanket replaces loose blankets in the crib that can cover your baby's face and interfere with breathing. Made of 100% certified organically-grown cotton, the fabric is free of chemical dyes, softeners and finishes. In addition to being safer and eco-friendly, it helps babies sleep better, too. It's a warm cuddly blanket they can't kick off; ensuring baby sleeps soundly throughout the night. Used in hospitals nationwide, the Halo SleepSack wearable blanket is the #1 choice of hospitals, recommended by safety organizations and is approved as "Hip Healthy" by the International Hip Dysplasia Institute. A portion of every purchase goes to First Candle/SIDS Alliance and The Canadian Foundation for the Study of Infant Deaths. Use over regular sleepwear to take the place of loose blankets. 100% organic cotton interlock. Size small fits 10-18 lbs; size medium fits 16-24 lbs.