You can't *convince* someone into having kids, whether the message is positive or negative
"You will be much happier when you have kids!"
"You'll be miserable in 20 years if you don't!"
That doesn't work ... especially if their peers aren't having kids. People are mimetic.
The most *effective* pro-natalism isn’t positively preaching or chiding … it’s for young people to just see kids around: Sitting in high chairs at brunch. Playing in the park. Walking to school.
It should be as unremarkable to see a parents pushing a stroller as it to see someone walking a dog
That's why it's so important we make neighborhoods multi-generational