We have used this book with all three of our children. It is very helpful in training your child to sleep on their own. We always receive compliments on our children and their behavior. Are the perfect? No. But, this was a great place to start with all three. The key to following this book is to use common sense. Many people have strong feelings regarding the Ezzo's parenting methods. We have not encountered any problems with the methods, when used the way they are taught. Not in extremes and using common sense when applying the methods.