Baby registry?

Hey y’all! I was just wondering when you decided to make a baby registry? I’m thinking of making one but I don’t know when to do it or what I should put on it. Did anyone have less than 20 items on their list? More than 30 items? How many is too many? Did you put a price limit on all items?? Like no more than $200 on a crib and no more than $60 on a swing?