Then fold it, so that the right sides are facing. Sew along the side. I used the re-enforced setting stitch here and then went back over it.
Next, pull one end through the center like your turning it inside out, but stop when the ends meet. Sew the ends together in a circle, so that you still have a hollow center. Leave about two inches open, so you can pull the fabric through and make it right side out. I re-enforced these stitches too. This is going to carry my most precious cargo ever. Can't do too much re-enforcing!
Pull the fabric through your 2 inch hole. This will turn it right side out and create the shape of the sling that you want.
You will have a little hole left. You can stop here and finish it with a hand-stitch. Or you can add a padding and pleats like I did.
Arabella weighs 35 pounds, so I needed a pad. I made a seam, at the top where the hole was left, all the way around about an inch wide. I then stuffed bamboo pillow filler (got it at JoAnn's) in the hole. I used a chop stick to push it through. I closed the hole by making a pleat and then sewing a square.
Please remember, I haven't had any formal training, so my stitching isn't pretty. I added the flower from my garden to distract you. : )