We received this book as a gift (and I'm giving it as one today) and it has been a lifesaver. We used it dozens of times a day from the time our daughter was about 8 months until now (20 months). She still oves it and we finally had to buy a second copy (she chewed on it a lot). It stands up to abuse really well, but this was too much to ask of any paper-based product. I wish there were more like this one. It's great for your purse or diaper bag, in the stroller etc.