This cotton SleepSack Wearable Blanket from HALO replaces loose blankets in the crib that can cover your baby"s face and interfere with breathing. In addition, the SleepSack wearable blanket helps your baby sleep better, too. It"s a warm, cuddly blanket they can"t kick off, helping baby sleeps soundly throughout the night. Used in hospital nurseries nationwide, the SleepSack wearable blanket is the #1 choice of hospital nurseries, recommended by safety organizations and is recognized as "Hip Healthy" by the International Hip Dysplasia Institute. Use it over regular sleepwear to take the place of loose blankets. It"s made of soft, 100% cotton interlock. Size small fits 10-18 lbs.; size medium fits16-24 lbs.; size large fits 22-28 lbs.; size extra-large fits 26-36 lbs.