What's the weight of the snake and the weight of the rodents? The easiest way to tell if he's getting enough to eat is by weight. If he's eating 10-15% of his body weight say once a week and still seeming hungry you could put him on a 5-day feeding schedule. Babies seem to eat a lot more readily than adults because they have to very quickly get off the bottom of the food chain before they're killed themselves. Some snakes will eat anything you put in front of them up until the time they hit 500-800 grams or so and then they slow down. He might just be hungry and he'll take it. So long as you're not power feeding (inserting the head of another prey item into the ball's mouth while it's already swallowing the first) you're probably okay offering until he refuses.