Sounds like you're under-feeding him, but without his actual weight or the actual weight of the mice, it's hard to be positive. (by "small mouse" you could mean a
"hopper", which is actually the right size for most BPs when they're hatchlings)
This: and you need to get & use a scale if you don't have one.
https://ball-pythons.net/forums/show...ing-Guidelines
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