About the hunter-gatherers, I read about it a long time ago but I forgot where. It makes sense though, the returns on hunting and gathering varies with the seasons and you can't adhere to a strict sexual division in labor for something as essential as food supply. The only exception being that the riskier hunting jobs are left to the men, since a tribe's ability to sustain its population depends more on women than men. But let's leave this to the anthropologists.
Wetnurses and nannies are full blown surrogate mothers, taking care of a small number of kids or even one. Childcare is much less than that, and cheaper by any standard. For some societies, Saudi Arabia comes to mind in particular, childcare would be financially viable for the bulk of the population and would enable a lot of women to work. But cultural taboos prevent this.
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