Underweight ball python?

[Drako21]

A lot of people 'maintenance feed' young snakes for sale. Not a big deal, really, and growth takes off when they're being fed more appropriate sized meals.

I kind of questioned that myself. I figured they might keep them small for whatever reason. It was just that I've seen many pictures/videos of other ball pythons around his age and they seem huge compared to him, lol. Now I'll just hope he continues eating(which seems very likely with his appetite) and let him grow. Thanks