It's a factor, it's not the only factor.
Decrease in teenage pregnancies, decrease in alcohol consumption, contraception and day after pills, higher levels of education, less socialized culture, less generational housing etc.
Having a child is more than often a deliberate, calculated decision that is made by adults whereas in the old world pregnancies happened left and right with little to say about it. Support systems existed because the problem was pervasive. Now the problem is generally gone, and the support systems thereafter.
No country has managed to reverse the trend of declining birth rates. The better quality of life people have, the fewer children people tend to have.
It's not just about who does and who doesn't have children, it's also how many children per family. 1-2 children is the new normal. My grandpa was #7.
Perhaps we can learn from the past? Birthrates between the world wars were below replacement level in much of the western world. Then the trend reversed for a while.
May I point you to the State of Israel? Its TFR sits at 3.
And if we really want to be nitpicky, and concentrating on the "reverse"-part of your statement, then even Balkan countries shine, as they literally managed to reverse the trend.
In South Korea the reports are they this is very different. Kids are not tolerated in many places, many couples have few kids, society makes it quite hard on moms as well.
0 - https://www.macrotrends.net/global-metrics/countries/isr/isr...
That same bump is now reversing and the general trend of depopulation continues to accelerate. IIRC Bosnia has the lowest birth rates in all of Europe.
I appreciate the push back; I was overly confident in that statement. I do think however that it's correct to state that the slow trend across all developed countries could be summarized as "aggressively downwards".
Israel is literally the one exception.
Some might decide to buy more expensive car or larger house and that's cool choice as well. But in the end will bring you just a temporary happiness and maybe some social status boost.
Screw consumerism, just have a child.
Love your own life, refuse to have children for free!
Unions and Fight for your rights, that's what we need