A queen trap-jaw ant. Wait no that would be terrifying.
In all seriousness, probably an alpaca.
"Aw it's a cute little (big) queen trap-jaw ant! How cute!" Then it bites you <.<
I can't come up with an animal because when I try to think of a species... In the end, every large species was once cat-sized (unless born otherwise).
Could be anything!
Thought this would be a super cute thread, lul
To me this is super hard buttttt... I would have to say a panda because why the heck not?! ♥‿♥
What about cows? They're born a lot bigger than cats.