Lol, I actually had this same question. I have a baby ball, I put some pictures of him eating, and everyone told me the prey was too small. The pet store I bought the rat at told me to feed him pinky rats, but they look a little small for him.
Idon't have the weight, I'm taking him to the vet on thursday, but here's a link to him eating, kinda hard to see the prey, but tell me what you think please.
that's a 10 gallon tank for size comparison.