The day Auggie was born had to be difficult for Nate and Isabel Pullman. How did the author create a sense of humour for the reader?

What chapter are you referring to?

Part 1 How I came to life

This is Auggie's narration and he talks about how hard mother and father work to make him comfortable and feel loved. Mother, for example, is a children's book illustrator. She usually draws "girl stuff" but attempts to draw Darth Vader: Auggie says the picture looks like a mushroom.