Santa's First Christmas by Mac Barnett, Illustrated by Sydney Smith, is a warm surprise!
I hadn't thought of Santa not celebrating Christmas because of course he is busy. When our parents have to work on holidays, we save things for them when they get home. Santa's elves decided he should get the best Christmas! Syndey Smith's illos are to die for (always are). You can feel the temperature of each spread, you are in the space with the characters, cozy or cold. It's beautiful and warm and the loveliest of any Christmas picture book.