If you want to know a little more about king cake, you can click on the following link http://kingcake.com/History.aspx
In France, we have 2 kinds of King cakes. It can be eather a brioche (with candied fruits)
or a frangipani (a puff pastry with almond pouder)
We put a "fève" in the King cake... but it doesn't have to be a baby. It can be a shape of a person or almost any shape you can think of.
Here is another link if you want to learn more on how we celebrate the King cake in France. Try to answer the questions at the end. There is also a recepie!