I call my three month old little man. I'll just go quietly over into the corner and hang my head in shame...
But anyway, I don't think I'd advocate having kids as a must to anyone. I'd advise that it might not be as bad as you think, and that if you're in a long-term relationship that looks like it's going the distance, then it's something that's worth considering and not being terrified of. But honestly, I'd be a dirty, stinking liar if I were to parade about as though it's nothing but upside with absolutely no negatives to speak of. There are plenty of instances where in just this short period of time I've lamented the good ol' days of being able to do what I want when I wanted. If that kind of thing is important to someone, it'd be stupid to preach that you'll still have plenty of the proverbial "me time," because that's a lie.
There are positives to it, but just not in the way that's easy to articulate. As such, I don't mind cautioning that parenthood isn't as bad as you think, but I also don't see a point in trying to coax people into it. There's plenty of good reasons to not want kids, and I don't think any "you'll never believe what my little man did today..." anecdotes offer a compelling reason to reconsider one's stance.