We call Arthur "Macaroni." It's become his nickname and he responds to it just like his actual name. It came about because we would call him Arthuroni, then I called him Arthuroni Macaroni, so he's now just Macaroni. People always think it's funny when we call him that, but it just stuck and it seems to fit him.
Here is a pic of him eating some macaroni and cheese, his favorite when we go out to eat somewhere:
He looks so grown up in this picture! Makes me a little sad...
Here are some recent favorites:
Proof that I really do love this kid: