I really want to teach my son to stop crying, he cries and I feel sorr…

I really want to teach my son to stop crying, he cries and I feel sorry for him and give him what he wants from the first cry. Someone says that's how it is, someone else says he's not ready. How many days did it take you to discipline your child? My sister, they have 4, all of them have 2-4 children. ??. They all had their second child on day one, the first one took 1-3 weeks.