Apparently (I can't find the source for this, but it stuck in my mind), faced with a glut of production after WW2, the US could either consume more, or work less. The choice was made to consume more, not least because the industrialists could cream off a larger slice of the pie that way.
Similarly regarding manufacturing and production glute, if the hard capital is fixed then so too typically is the hard production (not the case for many kinds of capital but it is for manufacturing) or at least capped. Just like with consumption, it’s a problem of what portion of capital is being expended on increasing production of things for children (housing, schools, kid stuff) or not. In both cases this is ultimately driven by the supply and demand stemming from parents themselves. But I don’t think there is a feedback loop because capitalism does not itself care whether capital goes to kids or not, only whether there is enough demand for capital expenditure to be profitable.