I don't know what it is, but books are almost a security blanket with this kid.
Climbing on the couch? Better take a book.
Sitting watching cartoons? Gotta have a book in hand.
Climbing on your sister? Definitely need a book. (If nothing else, maybe she'll accept it as a peace offering, right?)
Now don't get me wrong, I usually have a book in hand, too, but still. I think it's funny.
You should have seen what happened when I took the Handy Manny book away at bedtime. Actually, you probably heard it. That screaming wail right around 7 pm mountain time? Yep, that came from our house.
Still he's cute. Most of the time.