Each child is unique and what works for one does not work for the next, even if they are related. You have to parent like you are a scientist sometimes, I found that out with my oldest since he was clueless about his own needs and could not communicate with his cries what he needed. His younger sibs had differentiated cries for different needs, and this was revolutionary - before I had to be systemic to a fault. One parenting instructor I had talked about parenting being a dance that you do with your child, sometimes you lead and sometimes they lead but it is done together.
So use educated guesses tempered with a systematic awareness of what works and an understanding of what your goals are (living, whole adult that is healthy) to guide you. And above all else remember kids and humans are pretty resilient.
