This puffer in’t being inquisitive, this puffer is hunting!
Pufferfish eat snails, so they are just adorably figuring out the best way to eat their dinner. \uwu/
It’s also not even a baby. That’s a dwarf puffer! If not fed snails regularly, their beaks become overgrown, which is a big problem in puffers fed improper captive diets.
Dwarf puffers (unsure of what specific kind here, but not a pea puffer) are cute, smart and also kind of jerks to most other aquatic life. Seriously, don’t put them with anything else - everything is either big enough to eat the puffer or small enough that it’ll get brutally disassembled by the puffer, and while it’s not guaranteed yours will be vicious it’s just not worth the risk. I’d definitely dispute the person saying they aren’t inquisitive though: I’ve never kept one, but I’ve seen them in stores and they’re one of relatively few species that will watch you because they’re interested rather than because they think you’re bringing food.
Puffers also chase laser pointers: