7个月婴儿，羊乳喂养，面色苍白，舌有震颤。Hb60g/L,RBC2.5x1012/L,红细胞形态大小不等，大细胞中有淡染区扩大，血小板计数75x109/L,WBC5.5x109/L,MCV84fl,MCH29pg,MCHC0.34,骨髓有核细胞增生，巨早幼红细胞比例增高，骨髓细胞内外铁减少。诊断最可能为

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