Who is that Baby in the Mirror?

Carter has always loved looking into the mirror.  He used to look at my reflection in the mirror and smile ear to ear.  Now he's started looking at himself and will crack up laughing.  I like to sing him "Who is that Baby in the Mirror" to the tune of "How Much is that Doggie in the Window".  We rock toward the mirror and back as I sing.  The song goes like this:

Who is that baby in the mirror?
Who is that baby I see?
Who is that baby in the mirror?
He's cute as cute can be.
Bum, bum, bum (he bounces really big on each of these)

He also loves to play boo with the baby in the mirror.  I'll put him up close to the mirror and say boo, then pull him away again.  I know he doesn't know he's looking at himself yet, but he sure loves his reflection more than he likes looking at other babies.  Here's a video of us playing boo with the mirror.