cozy wearable blankets will have your child sleeping in comfort! double layered organic cotton design is warm and breathable. wearable blanket fits perfectly over footie pajamas for cool evenings or can be paired with a onesie for warmer nights. In addition wearable blanket encourages baby to sleep on their back until they can comfortably roll over from their back or tummy and eliminates loose crib blankets for the prevention of SIDS. • Small - 3-6 mo 10-18 lb • Medium - 6-18 mo 16-24 lb.