I think I would choose colors to make a top for the cute duck fabric and then to get the full benefit of the cute ducks use it as a backing. That way you don't have to cut into it. Or use some on front but leave enough of it for a backing!
The fleecy one would definitely be a cute backing or as a whole cloth quilt on front and use flannel for a backing.
Both are darling pieces for babies! Will be anxious to see what you come up with for them.