Consider all the child's symptoms, not just temperature. iStockphoto.com hide caption

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According to the Bureau of Labor Statistics, 47 percent of moms were in the labor force in 1975. By 2008, that number rose to 71 percent. James Tutor/iStockphoto.com hide caption

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Not all young girls avoid dirt. Hannah Rose Akerley, 7, plays in a gigantic lake of mud at the annual Mud Day event in Westland, Mich., last July. Bill Pugliano/Getty Images hide caption

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A student at Carlin Springs Elementary School receives a flu shot last January in Arlington, Va. Mandel Ngan/AFP/Getty Images hide caption

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