9个月男婴，母乳喂养，不规则加辅食，面色苍白2个月，肝脾未触及，RBC3.5X1012/L,Hb80g/L,MCV68fl,MCH24pg,MCHC0.27,WBC和PLT正常，网织红细胞0.015。最可能诊断是

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