The U.S. Chamber of Commerce warns that paid paternity leave will be a job killer, cost businesses too much, increase administrative burdens, and lower wages for workers who have to foot the bill for a perk that not every employee can access equally.

Yet, if paid paternity leave ever becomes a benefit as commonplace as two-weeks' vacation or a 401(k), the big winner, suggest researchers and scholars in the field, will be business itself.

Though the 1993 Family and Medical Leave Act entitles employees of either gender to take up to 12 weeks of unpaid parental leave to care for a newborn, and the Equal Employment Opportunity Commission recently issued "time for care" guidelines calling for equal parental leave for both genders, new dads are still expected to bring home the bacon, not cook it.