What's in Baby's world of play? A teddy bear? A toy train? A rocking horse? Baby's World of Play is the fourth title in the in the popular Baby's World series. These durable, non-toxic board books are perfect for babies under six months and offer bold, graphic, black and white illustrations for young eyes that are learning to focus. Other titles in the series are Baby's World, Baby's World of Shapes and Baby's World of Nature.