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© Ami Vitale / Panos Pictures..Mariem Mint Cheikh holds her son, Vadal Ould Talebned, as they wait in a health post after walking 18 km through the desert to Gaat Teidouma in the Affole region of Mauritania. The baby was weak and emaciated and was eventually referred to the capital of Nouakchott which is several days journey through the desert.