Ball Python very small for his age: how do I get him to grow?

[Bogertophis]

Thank you, it’s a huge relief to hear it is somewhat normal for him to be on the smaller size. And of course I don’t want to/won’t overfeed him, I just wanted to make sure he’s eating enough. Thanks again!

It's normal, & his health is way more important than size. Snakes grow their whole lives- he's got plenty of time to get bigger, & pushing too much food on him could do more harm than good.
Good question & it sounds like he's in good hands.