Which is quite remarkable, because up until less than a century ago when women “entered the workforce” virtually every woman who had ever lived somehow managed to care for her 3+ children.
Incidentally, large families do scale sublinearly with respect to the parents. The reason why is that even with merely natural spacing by the time they have a fourth child, the oldest is in a position to provide significant assistance. Every mother with a large family that I’ve spoken to confirms that the difficulty peaks with the third child and then plateaus.
It is remarkable. I have one child, and it is by far the hardest thing I've ever done - far harder than any job I've had. It doesn't help that both parents are working full time. Maybe parenting has changed recently and we are too hands-on, but I can't imagine having 2, much less 3+ running around. Even if one of us stops working to raise the kids full time, it's way more taxing, physically and mentally, than working a white collar job and paying for child care.
I recall before we lived in nuclear families [somewhat recent phenomenon] communal raising was commonplace. Grandparents, aunts, uncles, neigbours, etc. would come help.
Incidentally, large families do scale sublinearly with respect to the parents. The reason why is that even with merely natural spacing by the time they have a fourth child, the oldest is in a position to provide significant assistance. Every mother with a large family that I’ve spoken to confirms that the difficulty peaks with the third child and then plateaus.