It really is a personal choice. Some do , some don't :? Also how do you want the quilt to look when it is totally finished, and what type of batting will you be using :shock: I know a lot more to think about LOL
If you use polyester batting that doesn't shrink when washed , the cotton battings shrink some, so if the fabric is prewashed but the batting isn't the quilt will have a wrinkled look to it when you wash it all together. You can wash the batting and fabric to get less to no wrinkles. Or you can NOT wash the fabric and batting and they should shrink at about the same rate.
Clear as mud :? :roll: