Fruit Loops, yep, that will give any child the kaleidoscope of poop. Fruity Pebbles, Lucky Charms, etc. Take away those foods for a few days and he will be back to normal, as far as the crayola of poop goes.
My first thought when I read the title of this, was, what cereal is he eating, lol. Thankfully my kids developed a love of Cheerios and Kix early on, lol.