The Safe Sleep Wear-a-Blanket is recommended for babies 0-6 months, weighing 10-18 pounds, and 23-26 inches long. It gives baby cozy comfort without the risk of suffocation from loose blankets. It's Comfort Wraps provide soothing tummy support and keeps baby positioned safely inside. It has fresh air mesh vents to help prevent overheating. The Bottom Up zipper makes for easy diaper changes. The body is made of 100% cotton. The Comfort Wrap outer is 100% nylon and the inner 100% cotton. The mesh is 100% polyester. Care instructions: close all fasteners including zipper and snaps before washing, machine wash warm inside out with like colors, use only NON-chlorine bleach when needed, tumble dry low. Do not wash with delicate fabrics and do NOT iron.