8个月婴儿，单纯母乳喂养，面色苍白2个月。肝肋下1.0cm，脾肋下未触及。Hb80g/L,RBC3.5xlO12/L,MCV68fl,红细胞大小不等，中心浅染区扩大，网织红细胞、血小板和白细胞数均正常。最可能的诊断是

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