Books are items or things that can be use, and interacted with by and for your baby. There are 4 different types (The Legend of the Flying Manor, The tale of the Enchanted Rainbow, The Story of Blueberry, the Small Fairy and The Fable of the Firefly Prince) and possibly more to come. You can see them in the boutique, your 'home', and various nurseries. Reading these books are optional, and are not mandatory for your baby's growth.