But the biggest cost of raising a child may simply be time. Time that you spend taking care of the kids is time that you don’t spend at work earning money. In the ideal situation, both parents would have flexible work situations, and both would take time off to share child-care duties. Unfortunately, most of us don’t live that dream. Many have rigid work schedules, and often put in many extra hours at home or at the office -- Americans work longer hours than almost anyone in the developed world. And many are single parents. What that means is that a lot of American parents are forced to make an all-or-nothing choice between the workplace and child care.