"The Life and Adventures of Santa Claus" by L. Frank Baum

This book is entirely enchanting.  I loved it so, so much!  It's charming and sweet and cheerful and lovely.  I can't believe I'd never even heard of it until about a month ago!  Especially because it was written by L. Frank Baum, the guy who wrote The Wizard of Oz.

In this story, an abandoned infant is rescued and raised by magical folk living in the forest when the world was very young.  He's named Neclaus, but called Claus for short, and grows up happy and carefree...