A sign limiting the purchase of baby milk formula powder hangs on the shelf in a supermarket in London, Wednesday, April 10, 2013. Some British retailers said Wednesday they are limiting purchases of baby milk powder after noticing some people were bulk buying unusually large amount of the products in stores, apparently part of an unofficial export business to China, for parents who want international brands for their babies. (AP Photo/Kirsty Wigglesworth)

Associated Press
A sign limiting the purchase of baby milk formula powder hangs on the shelf in a supermarket in London, Wednesday, April 10, 2013. Some British retailers said Wednesday they are limiting purchases of baby milk powder after noticing some people were bulk buying unusually large amount of the products in stores, apparently part of an unofficial export business to China, for parents who want international brands for their babies. (AP Photo/Kirsty Wigglesworth)
A sign limiting the purchase of baby milk formula powder hangs on the shelf in a supermarket in London, Wednesday, April 10, 2013. Some British retailers said Wednesday they are limiting purchases of baby milk powder after noticing some people were bulk buying unusually large amount of the products in stores, apparently part of an unofficial export business to China, for parents who want international brands for their babies. (AP Photo/Kirsty Wigglesworth)
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