I put a small Nativity up on my desk at work (yes, I work someplace where this will not get me fired. In fact, where I work, it's encouraged.) A co-worker chided me for having Baby Jesus in the scene already. I pointed out that, in this scene, Jesus was glued in - moot point.
Even if He wasn't glued in, I'd still have Him there. I'm one of those who puts Baby Jesus in the manger when the scene goes up. There are a couple of reasons for this.
First, I collect Nativity sets, and I would spend all Christmas morning trying to match up which Baby goes in which scene. Second, I am trying to prevent a tragedy.
One of my nephews, a few years ago, attempted to have that "perfect" Christmas, wherein his children would anticipate the birth of Baby Jesus on December 25, and he left the Baby out of the crib This way, the tumult of opening gifts on Christmas morning could be paused by placing the King of Kings into his little manger.
Except he lost Baby Jesus.
Yep, somehow, during Advent, my nephew lost track of the "safely" tucked away Christ Child. He's never been found.
Don't let this happen to you: put Baby Jesus in the crib.
The University of Dayton has an outstanding Nativity collection. It's a great way to spend a few reflective minutes during Advent. (And yeah, Baby Jesus is in the cribs....)