For all the talk of capital-gains tax cuts, millionaire surcharges and a shifting rate bubble, some of the biggest winners of this fall's budget battle were those most in need: the nation's poor children. Topping the list of new benefits for low-income working families: some $4 billion over the next several years for more and better child-care services, a five-year $12.4 billion expansion of the earned-income tax credit, and the $5.2 billion creation of a health-insurance tax credit.
Public health is one of the areas in which Congress has promised to be most generous to children. The law provides that everyone...