I order 2 sets of books for my grandkids. The 0-3 and the 3-6 ages. Each month they eagerly await their books. I only hope they arrive at the same time because there's disappointment when they arrive separately, one child believes they are left out. I've only had one duplicate, which was quickly replaced with a great replacement! It's a great feeling watching kids excited about books and reading in general. Thank you Kids Reveal!!!