The data very clearly shows the opposite: economic development and rising income levels are very strongly associated with decreasing number of children per moth

The data very clearly shows the opposite: economic development and rising income levels are very strongly associated with decreasing number of children per mother. Birth rates in nearly all the high income nations are below replacement. Most of the middle and low income countries are on the same path, with central Africa being a notable exception. Before his dead Hans Rosling did some great talks about this sort of thing. I'd suggest watching at least one of them on youtube or such.