Since it's a baby, he can easily fit in a sandwich-sized plastic container. You can put some air holes in the sides, just make sure they are small enough so he can't get through them. A small soldering iron is my favorite tool for making small and smooth holes in plastic containers. Add some substrate (paper towels work well ) and a small water dish, add your snake, make sure the lid is on tightly, and then place it on top of your refrigerator. The temp up there, heating the underside of the container, is just about perfect for a corn snake.