Is LO eating from his/her highchair tray or do you offer food on a plate or in a bowl?
I just bought this plate: http://www.amazon.com/Oxo-6104800-OXO-Plate-Aqua/dp/B0038JDURU a couple of days ago for cheap at TJ Maxx and DS uses it as long as he is interested in the food. Once he gets full and bored, he starts to play with the plate. We will probably hold off for another week or so and then try again. He seems to like it!