(And, no, we're not proud of it.)
As I was sorting baby onesies, I showed Seth a onesie that I loved for him to wear when he was a baby.
He put the onesie up to himself and said "it still fits!"
I laughed and told him no...he is too big. He wore that as a baby...it wouldn't fit him now.
So, to prove my point (see, he comes by it honestly!), I told him to stick his arm in the arm hole of the onesie.
He did it!
I laughed it off and said that I didn't think his head would fit through the neck hole.
He did that too!
So I told him he could just try it on...