How nice of you to do this for your sil. You don't really need a pattern for the hooded towels, baby wash cloths and burp cloths. Just pick a size that you think is appropriate. I usually use flannel when I make mine and I always wash the fabric before cutting. Otherwise the cloths will get all wonky!! I also round my corners (using a saucer or bowl turned upside down. Sew right sides together leaving a space for turning. Turn right side out and close that space. For the burp cloths I usually put a decorative stitch all the way around. For the washcloths I just use a straight stitch around the finished product. The decorative stitching can be a bit stiff for such a small washcloth. For the hooded towels. Cut out the size needed for the towel (I use flannel here too). then cut out a square to use for the hood and fold it diagonally and attach. I have used my serger to finish the edges and I've also used 2 1/2" binding sewn all the way around and machine stitched. It's just a matter of preference. there are also tutorials online if you do a search. Happy Sewing.