Do Cryed Out Methods Work?

The three main questions parents want to know is, is it going to work? Is it going to harm my baby? And is it goingto harm my relationship? So I go deep into the science on those three questions. My first born was so sensitive that he could not have tolerated sleep training. But my second born probably would have been perfectly fine. He would have fussed a little bit and gone right to sleep. That's where we think about our child's temperament.