|Right sides together, stitch tube to pullover (in this photo, I turned the pullover inside out and tucked the fleece tube inside of it).|
|Choose a separating zipper that is at least 3/4 of the length of the sleep sack, and preferably longer.|
Cut the sleep sack down the middle in front as long as the zipper.
|Cut little triangles to use to soften the top edges of the zipper.|
|Stitch the triangles over the top of the zipper to protect baby's neck and chin from the zipper's edges.|