It makes your life meaningful in a way nothing else can.

Politely disagree. I feel like one should already have found a way to make their life meaningful before having a kid. Having a child just adds to it, changes the nature of that meaningfulness, enhances it ... but not be the cause of it.

Nope. You should find a way to be happy. Meaning is irrelevant although most people find meaning in responsibility.

But you cannot know about that before you have kids? Instead, that's something you discover afterwards?

(And I think the question was about before :-))