Checkerboard books

Gyo Fujikawa was an American illustrator and children's book author. A prolific creator of more than 50 books for children, her work is regularly in reprint and has been translated into 17 languages and published in 22 countries. Her most popular books, Babies and Baby Animals, have sold over a million copies in the U.S. Fujikawa is recognized for being the earliest mainstream illustrator of picture books to include children of many races in her work, before it became common to do so. (from Wikipedia) She worked for a time for the Walt Disney company, and she also designed a few postage stamps.