Tonight's bedtime story list included The Bare Naked Book (specifically the newer edition) by Kathy Stinson, illustrated by Melissa Cho. (The other way to make sure you have the right edition, look for Melissa Cho.)
This book is FANTASTIC! Let this be your warning: my son felt the need to SHOW me each body part as we read the book... including genitals and bum (which are also represented in the book). So... know your kid and audience.
That said, this book talks about all the parts of the body and how they can be different from person to person. The people in this book... so beautiful! It includes people of all sizes, people whose gender is not apparent, people with hearing aids, people missing body parts or using prosthetics, a person with vitiligo! It shows a nursing mother. And it celebrates bodies.
I love this book so much I think I am going to have to add it to our personal library! Look at it at your local library or order it for yourself!
