You also might try setting your stitch length to 0 and make sure you're lowering the foot lever, sometimes it's easy to forget and leave it up. FMQ is a matter of trying to move your hands and foot at the same time and can take some practice. Lots of folks suggest you hold a pencil in your hand and move the paper to get the feel of it before you try it on fabric.
Cross hatching would look just fine and I'm sure your baby will love the quilt to death because mommy made it!!