I made this simple baby sling after Wyatt was born and although he didn’t really like it (translation: hated it), I thought the pattern was good. I just did mine single layered because I used a home-decor weight fabric and I didn’t want it to be too hot for him in Arizona, but you can also make them with a lining. You can find the pattern here. It’s the same site that I got the shopping cart cover pattern from. The author calls it a “pouch” sling.