If you can get your child to stand still long enough, you can make a tracing of his shadow on a sunny day.
DirectionsGo outside with your child on a sunny day. If your child will stand still long enough, trace his shadow on the sidewalk or driveway. Have him change positions, then trace his shadow again. Make several tracings, then see if your child can fit his shadow back inside the tracings.
For a fun alternative, trace his shadow on a big sheet of newsprint or other paper. Let him fingerpaint his shadow or color it with crayons or markers.