Quilt Question 
Is this pre quilted or just the top?
I read the description: 
 Add color and charm to any baby's room with this quilt top classic nursery design. Quilt top kit includes 30% cotton/70% polyester machine washable fabric that is pre-quilted and pre-finished with designs stamped in washable blue ink.
So, what do you think?
Also,  how do you stitch a pre-quilted piece?  Will my stitching go to the underside or am I somehow avoiding the back?   I'm so confused!!!