Rules only apply to quilts entered in shows. Do like our ancestors did - whatever is appropriate for your circumstances. In Phoenix bed quilts don't need much if any batting, but in the mountains of Arizona most quilts will need good batting. I'm sure the same thing applies in other areas of the country. Also, the time of year could make a difference. For a baby born in late spring or summer I wouldn't want a heavy quilt. For a baby born in the fall or early winter I would.