Those calming breaths you learned to do in childbirth class? They'll come in handy in the baby superstore aisle, too. That's because baby products are a $9.8 billion industry in the U.S. with hundreds of new products added to the line-up each year. To save money, it pays to buy products that do more than one thing or that can be converted to something non-baby-related later. Here are four baby products that can give you your money's worth.