What size mouse to feed ball python?

When snakes eat, they un hinge their jaws, which allows them to eat incredily large meals. My 13 foot python can eat a baby pig. For a ball python that is about 2 years old...you can feed them anything from a larger mouse to a baby rat. in fact, since he is probably malnourished...you should start off feeding him larger mice, and gradually give him smaller rats.