My wife and I heard about teaching babies to sign when our son was 9 months old. We immediatly bought this book (and kit), while a friend gave us "Baby Signs" a book by some other authors. We found this book (and the kit as well) confusing, boring and full of ASL signs no child's fingers could possibly make or child's mind discern. The other, simpler, cheaper, more helpful book, "Baby Signs" was a godsend. Using the other book we taught our baby to sign and its amazing. Now 15 months he's speaking much more than his counterparts and still signing away, making up his own signs, asking us questions, and crying with frustration much less than his peers! Teach your baby to sign, its wonderful! (but shop around because this book isn't it!). P. Spence