患儿8个月，呕吐、腹泻2天人院。发病初伴发热，咳嗽，呕吐2-3次/天，腹泻7-8次/天，水样便。大便镜检少量脂肪球，尿量不少，口渴，略见消瘦。入院时体温370C，双眼窝及前囟稍下凹，皮肤弹性尚好，四肢温暖。最可能的诊断是

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