He is NOT too small for worms. Pinhead silkworms are great for little guys, as soon as they start shooting. I use what I have termed silkworm lollypops. Just put a ball of chow about the size of a small marble on the end of a tooth pick, lay it in a mass of newly hatched silkworms (or whatever size you want to feed), when it is amply covered poke it in the branch of one of your plants. The little guys love this, and it is a great way to ensure they are getting enough calcium and good hydration.