heavy weight no-sew fusables are not a good choice in a baby quilt- they make a hard-stiff surface- better suited for wallhangings- items that do not get washed.
there is no reason to use a 'heavy-satin stitch' you can stitch down your fused appliques (using heat N bond light, or steam a seam lite, wonder under---what ever) with a blanket stitch, a regular small zig-zag- even a straight stitch. many of us who applique all the time never use a satin stitch.