In this Wednesday, Nov. 22, 2012, photo, Eva Cevallos with her eleven-month daughter, Quinn, shop during the Thanksgiving Pre-Black Friday event at the Walmart Supercenter store in

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In this Wednesday, Nov. 22, 2012, photo, Eva Cevallos with her eleven-month daughter, Quinn, shop during the Thanksgiving Pre-Black Friday event at the Walmart Supercenter store in Rosemead, Calif. Wal-Mart Stores Inc. offered a weak business outlook Thursday, Feb. 21, 2013, as new economic challenges for its low-income U.S. shoppers start to take a toll. (AP Photo/Damian Dovarganes) less