Most people misunderstand shrinkage. Once a fabric is quilted into a quilt, it becomes one with the batting and the batting controls the shrinkage. Certainly fabrics shrink in different ways when washed by themselves. However, once bound by a reasonable amount of quilting into a quilt, none will shrink more than the batting allows. This is why people who don't prewash fabrics and/or don't prewash pre-cuts and/or mix prewashed with washed fabrics don't have hugely distorted quilts when they are done.
The above does *not* apply if you tie a quilt, or if the quilting is 12" apart.