Is this possible?

lol, this may sound weird, but ... is it possible for a baby to be older than you thought? Like my son is 2 months old, but i think he was in the tummy longer than he should have been, i think he should be atleast 3 months because he is doing things that freak me out for a 2 month old..he can already roll over both ways, he can grab for toys and put them to his mouth, he has the rainforest bouncey and can spin the birdy on it...its just strange. do babies really grow up this fast? He is my first and i feel like i never had the time where he was just a little baby...anyone else felt this way?