Apart from access to birth control and family planning, and the reduced need to have someone to support you in old age or work farm jobs that don’t exist, education plays a part. Once you are no longer trying to survive, you see that overpopulation and environmental effects of kids are maybe not worth having them for their own sake. Having one or two becomes much more the norm than big families.
Women have more rights and economic opportunities. More education. More contraceptives and abortion. Lower mortality rates. In Somalia for instance, 10% of babies die. In a developed country it is less than 1%. A lot of undeveloped countries are very agrarian so having more kids to help at the house is good.
A lot of Less Economically Developed Countries have huge parts of their economies dependent on farming/herding etc and also have high infant mortality/low life expectancy and worse medical care. So having lots of kids means having helping hands with working the land, and having backups in case some of the kids die. Throw in religion/conservative societies and lack of birth control and you get rapidly growing populations.
More Economically Developed Countries are basically the opposite. Service based economies with low infant mortality and higher life expectancies. Couple that with less conservative societies, abundant birth control, and better medical care means sex in not primarily for procreation anymore and people live longer.
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