It's not caused by a puncture, it's usually a seal wearing out but that sounds kinda new for that to happen(powertrain warranty maybe?). If you don't notice anything on the ground, it's going to be a pretty slow leak/not something I'd worry about.
It might be worth investigating further because that's not very old for it to go. It could be caused by a bad PCV( it's a pressure release valve that prevents excess gas buildup in the crank case which can force oil pass the seal). That's a cheap fix, and replacing the seal without checking that would just make it happen again.
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