We purchased the book 'Your Baby Doesn't Come With A Book" before and learned so much eye-opening information as first-time parents. Although the book was so helpful it only prepares the first 4 weeks of the newborn period, we wished that we could learn more throughout each important stages of our baby. The wish answered when we discovered this Sleep Program, so we didn't hesitate to purchase the who bundle as we knew the quality is guaranteed by starting with the book. We're currently going through the second stage, and our bub is settling in much better, and is very content. We're excited to unlock more from the program as our baby grows.