They gave it to us when our baby turned one. From the first moment, it caught his interest and since then, he doesn't go a day without playing with it. After that, we got more books from the same series and whenever we go for a walk or travel, we always take them with us. It is a guaranteed enjoyable activity. They also helped with fine motor skills because the child tries to find the right spot with his fingers to produce sound. The size and weight of the books are ideal for him to play with them on his own without adult assistance.