Talk to a two year old.
The crib is completely natural if you are two, because *hopefully* the basis of your world is mummy, daddy and you.
Who is the most important person in the scene? The baby!
Add in some animals to boot and kings with presents and there we are.
Now to teach my nephew the lesser Christmas fact of Auntie Leutgeb's birthday.
He can help me blow my candles out.