Here 's another
A detailed argument.
www.fhu55.com/sites/default/files/hanehalki/Okumalar/Children%20as%20Public%20Goods.pdf
Increases in the private costs of raising children, however, are exerting tremendous economic pressure on parents, particularly mothers. Economists need to analyze the contributions of nonmarket labor to the development of human capital: as children become increasingly public goods, parenting becomes an increasingly public service.
Children.. have been described as consumer durables providing a flow of utility to their parents, investment goods providing income, and public goods with both positive and negative externalities. Children are also people, with certain rights to life, liberty, and the pursuit of happiness.
However we categorize children, we know that the consequences of raising them are changing. Economic development tends to increase their costs to parents in general, and mothers in particular. Yet the growth of transfer payments and taxation of future generations "socialize" many of the benefits of children. All citizens of the United States enjoy significant claims upon the earnings of future working-age adults through Social Security and public debt. But not all citizens contribute equally to the care of these future adults. Individuals who devote relatively little time or energy to child-rearing are free-riding on parental labor.
Increases in the cost of children have also been associated with trends that shift a greater share of the cost to mothers, such as new child-custody laws, growth in the proportion of families maintained by women alone, and poor enforcement of fathers' child-support responsibilitie..
However, public policies have provided far greater benefits to the elderly than to mothers and children on their own, particularly in the United States. Social Security expenditures dramatically reduced poverty among elderly men and married couples
Those who benefit from children's future income do so partly at the expense of present-day parents…
Moreover, there is no reason to assume that parents are equally affected: mothers often invest more time, energy, and affection in their children than do fathers..