This cute sweater is knit in one piece from the hood to sleeve division then underarm down. The sleeves can be knit in the round or straight. Instructions are included for both techniques. You should have basic knitting knowledge, knit, purl, decreasing and bind off. There is a sewn in zipper for the back closure. This is very easy to put on a wiggly baby and has been a favorite in my family for over 30 years!