Feed him at least mouse hoppers. Any pinkies are too small.
He's testing the limits of his enclosure and this is normal for about the first week.
Wait at least a week to feed or handle him, then give him something that is about as big around as his widest point. or 10-15% or his body weight. You can offer while he's in shed. Some take it, some don't. Don't leave a live rodent in with him unsupervised.
Read the caresheet and any sticky that catches your eye. "Glass tank setup" is probably very relevant. I hope you have at least two identical very tight fitting hides, and some sort of under tank heater (UTH) regulated by a thermostat. Probes in the right place, digital thermometer and hygrometer (dials suck). Pet stores never give the right info.
It really sucks that most people come here knowing absolutely nothing. I did it myself, but it just sucks that that's the way it is. And we don't know what you know or think you know because petstores almost never know anything! Hatchlings eat mouse hoppers. No ball python should ever be fed pinkies because they don't need something so small! Some people have it mostly right, some have no freaking clue! The caresheet is slightly incomplete, so I have to offer the above information in addition to saying, "Read the caresheet."
Sorry about the little rant. Good luck.![]()