My little one, Aila, is 2 months old. She is breastfed when she wakes up and then she is breastfed to sleep usually, sometimes is rocked to sleep. How do I know when she is ready to use "Pick up/Put down"? That method worked great for sleep training my other child. I also saw on another post that you are not supposed to use "Pick up/Put down" until all other methods are exhausted. What are the other methods besides the "4 S wind down" and "shush pat"?