I have kids, but I don't understand how some people feel like it's an obligation to have them.
Nobody should feel obligated to do so. It's damn hard to do more or less properly and requires quite a bit of sacrifice.
Oh, and if society as a whole complains about a low birth rate, maybe let's focus more on the hardships the new generations have to face: hard to find and keep a job, unfair pay, costly rent, and the nearly impossible cost of homeownership.
Let's tackle those and see what happens instead of pressuring people into parenthood.