3-year-old plump， healthy-appearing toddler came to your office for her health maintenance examination. In discussing her dietary history with her mother， you found that the child refused solid food，instead preferring to drink cow’s milk almost exclusively. The parents tried to cut her off once，but could not endure the subsequent whining and gave in to her demands for milk. Her blood pressure， heart rate， and respiratory effort were normal. Her complete blood count was significantly reduced with a hemoglobin level of 70g/L and an MCV level of 60fL.The most likely diagnosis for this child isAppropriate therapy should include：

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