It also features a gorgeous ruffle trims to the top, making it gorgeously girly, and the 1.0 tog rating provides a mid-weight that's perfect for keeping baby cosy. Our smallest sleeping bags, designed for babies aged 0-6 months, also feature poppers beneath the armholes to create a smaller, snug fit. Outer: 100% cotton Filling: 100% polyester Lining: 100% cotton