Just want to warn you if you call him "Little A" The first thing that came to my mind was "Little A-Hole" No offense meant, but thats what came to mind
Wow I never even thought of that option at all.
Then again I am sarcastic so it might fit him.
It seems funny to think of my baby as a smartass child though, lol.
I won't be changing it though, I love the nickname though.