What about those children who are just beginning to sit but are still very fragile so they can't be left sitting? This was made from a piece of ABS plastic, white Ethefoam (or any firm foam), and 3M Spray adhesive. The child sits on the plastic, which keeps the foam from moving as they lean on it. Need a tray? I often use a rectangular cardboard box with one long side cut out. Or you can use a behind the sink shelf that we found at this particular home.