Birth & up. These books are specifically designed for babies making them a great introduction to books. Using well-known nursery rhymes and songs, these books provide a perfect way to bond and share quality time. The stories encourage language development by introducing little ones to sounds and patterns of speech. When combined with actions, these stories can stimulate the brain and help in muscle development. Books have card stock pages, rounded corners, and developmentally appropriate text with colorful illustrations. Board book set of five. 12 pages each.