If anyone remembers the olden days, or babies flannel fabric sleeping bags, this is a knit version! It is fairly easy to knit, from top down. You can add the easy duck graph, or knit in stripes to use up yarn! This is so comfortable for babies! We like the bottom that ties with a ribbon, and opens up easily to change babys diaper. Warm and cozy, so baby will sleep the night away! Uses sport weight yarns, 24 circular US # 4. Fits babies up to 6 or 7 months. A great baby shower gift!