While advanced countries are experiencing demographic problems, developing countries are underutilising their youthful population. China, Japan, and some Western nations are giving incentives to families to give birth to more children because of an aging population. In the case of Bangladesh and other developing nations corruption is their main problem.
The youthful population is an advantage because it could propel economic growth. But when national resources are misused, citizens become a burden rather than assets to the country.
Japan has an ultra low fertility rate, giving those incentives would it actually help? Citizens have levelled up to the no-marriage lifestyle, it'll take decades to rewire how people in those countries think of making children. The cost of living in Japan is high and they assume it'll be hard to raise kids in an expensive nation.
It is not having "less kids" that is the problem, the population going down in numbers is actually fine, do not believe the wealthy who wants you to have more, do not believe the media who is owned by it, and do not believe the brain washed normal people who think this is a problem. Earth does have enough resources for 8 billion people, even more. But money does not, we do not have enough jobs and money to go around for 8 billion people.
So rich wants you to actually work for them for cheap, by having plenty of people fighting over the same jobs. The problem however is having too many old people, we are going down in population which is fine, but we have more old people that needs to be taken care of, than the young people who can take care of them, financially I mean.