Reddit mentions of Ancient Egypt: Tales of Gods and Pharaohs

Protection as she grows up.

Maybe Yes, Maybe No (LINK)

by Dan Barker

In today's media-flooded world, there is no way to control all of the information, claims, and enticements that reach young people. The best thing to do is arm them with the sword of critical thinking.

Maybe Yes, Maybe No is a charming introduction to self-confidence and self-reliance. The book's ten-year-old heroine, Andrea, is always asking questions because she knows "you should prove the truth of a strange story before you believe it."

"Check it out. Repeat the experiment. Try to prove it wrong. It has to make sense." writes Barker, as he assures young readers that they are fully capable of figuring out what to believe, and of knowing when there just isn't enough information to decide. "You can do it your own way. If you are a good skeptic you will know how to think for yourself."

Another book is "Me & Dog" by Gene Weingarten.

And Born With a Bang: The Universe Tells Our Cosmic Story : Books 1, 2, 3

Here Comes Science CD + DVD

The Magic of Reality by Richard Dawkins

Bang! How We Came to Be by Michael Rubino.

Grandmother Fish: A Child's First Book of Evolution

Also:

Greek Myths – by Marcia Williams

Ancient Egypt: Tales of Gods and Pharaohs – by Marcia Williams

God and His Creations – by Marcia Williams

"I Wonder" by Annaka Harris

"From Stardust to You: An Illustrated Guide to The Big Bang" by Luciano Reni

"Meet Bacteria!" by Rebecca Bielawski

See also Highlights for Children - this has materials for younger children.

Atheism books for children by Courtney Lynn

"It Is Ok To Be A Godless Me", "I'm An Atheist and That's Ok", "I'm a Freethinker", "Please Don't Bully Me" and "I'm a Little Thinker" etc.

Courtney Lynn has a couple more for grown ups as well.

Grandmother Fish, free in PDF form online

A child's first book of evolution.

15 Holiday Gift Ideas for Secular Families

Bedtime Bible Stories by Joey Lee Kirkman - for mature teens only

Coming up: TINY THINKERS is a series of books introducing popular scientists to children, by telling their stories as if the scientists themselves were kids!

I wasn't able to find a single series that I liked. The one that comes up first on Amazon is the National Geographic "Treasuries" series, but those bring a strong western bias, talks down about the 'barbarians' who believed those things, and ultimately tried to reconcile the myths of other cultures with Christianity. Which totally defeats the purpose of teaching mythology in the first place. So I ended up curating my own collection of books that were a bit more objective and unbiased.

Here's a couple that I settled on:
https://www.amazon.com/dp/0763663158
https://www.amazon.com/dp/0689868855
https://www.amazon.com/dp/0385015836
https://www.amazon.com/dp/0804838070
https://www.amazon.com/dp/1573060798