My 15 month old son loved this book as soon as he set eyes on it. He was fascinated by pulling the tabs and turning the wheels. The only trouble was that by one week, one of the pop-up tickle monsters was broken, and by a month, practically the whole book was a wreck. We tried to let him read this book only with supervision, but he just loved it so much that when we put it high up out of reach he was climbing and getting into really dangerous situations to try to get to it! Eventually we gave in and put it down again and now only 20% of it is functioning the rest has been ripped out. It's a fantastic book, but I'd urge the publishers to make the moving parts out of a more robust material, such as plastic, instead of paper so that it will last longer than a month.