Parental leave temporarily moves labour output from the measurable "economy" to the non-measured domestic economy (and displaces a small amount of what would ot

Parental leave temporarily moves labour output from the measurable "economy" to the non-measured domestic economy (and displaces a small amount of what would otherwise be wage-labour childcare by non-parents). Children raised in this way will require childcare of their own but I don't see how the labour required to raise children goes up over time unless the fraction of the population which is children goes up.