Colors - Colores
This bilingual board book by Eric Carle is super simple, but it's useful to introduce some basic vocabulary and sentence structure to babies and toddlers. There doesn't seem to be a coherent theme for the vocabulary words that accompany the colors, but they're useful words (dolphin, fire truck, bee, tree, cat, grapes). Several basic colors are missing, but it covers blue, red, yellow, green, orange, and purple. Each page has a sliding panel that reveals English on one side and Spanish on the other. My son loves pushing the panel back and forth. It keeps him engaged for a little while.