The Rookie Toddler series of board books continues to offer a useful array of titles spanning a broad series of general-interest topics. Clarity is the name of the game: The photos are precise, the text is large, the captions oversize, and the patterns repetitious. There are no sentences at all in Big and Little Things That Go, only labels. For instance, "big boat" beneath a luxury cruiser and "little boat" beneath a rowboat. Each book ends with an exercise and pointers for how parents and educators can extend the lessons. Nothing surprising here, but it's flawlessly executed.