Contrary to the popular opinion apparently expressed on this thread, it is not necessary to concieve children every time you have sex.
Some of the possible reasons contributing to smaller families in big cities are likely to be:
1) cost of housing being higher, particularly cost of larger houses tending to restrict family size choice
2) higher standard of living of those in cities compared to rural areas
3) greater opportunities for young people leading to a delay in marriage/serious cohabitation and having children
4) more work opportunities resulting in women choosing to have smaller families and spend more of their time in the workforce.
I am sure there are others.
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"How many legs does a dog have if you call the tail a leg? Four; calling a tail a leg doesn't make it a leg." Abraham Lincoln
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