I just love the color choices in your quilt! The baby doesn't care what you name it. He will call it "Blankie" or "Woobie" or something like that!
I always mark my quilt before I sandwich. That way my lines are straight and pins don't get in the way. For kid's quilts, I usually do either a grid or chevrons since it will be washed a lot. I have an Omnigrid yardstick that is 1 1/2 inches wide. I lay it corner to corner and then mark on the outside edges. Then I do that on the other side to make an x. Then I build the chevrons by just moving the ruler over and marking again. Very simple and always looks nice.