For $235,000, you could indulge in a shiny new Ferrari—or raise a child for 17 years. A government report released yesterday found that a middle-income family with a child born last year will spend about that much in child-related expenses from birth through age 17. That's a 3.5% increase from 2010. The report declared housing the single largest expense, averaging about $70,500, or 30% of the total cost. No. 2 expense? Child care.