In the December 11, 2012 NY Times, a letter to editor was published about the diversity in children’s books. Link is: http://www.nytimes.com/2012/12/11/opinion/the-diversity-inside-a-childrens-book.html
We are increasing the number and quality of diverse backgrounds and stories in children’s books, and that progress is encouraging.
You may not know of this one: Daniel Harrington Fairbanks the Third and a Day on the Farm by author Todd Zoellick. This third book in a series by Todd uses farm animals to help convey the importance of embracing diversity. The book, its story and artwork are splendid!
I have not run a Lexile on the book, but I suspect it is around grade 1-2 Reading level. You can find Todd’s new book at link: http://www.goodreads.com/book/show/16276209-daniel-harrington-fairbanks-the-third-and-a-day-on-the-farm