offered for 3 years my son and it really is a fan, cult book he claims several times a day !! this book on the human body is really great fun, and very attractive with all these pop up and pull tabs (eg for the 5 senses there eyes with dilated pupils, language that draws, and smell by rubbing it off a good smell, hearing with one ear open and it makes noise and finally touch with all aspects: rough, smooth, soft, spicy and the baby in her awesome water bubble !!!! anyways c the best to learn c sour !! I recommend it to all fair share against it! attention has not damaged zippers!