4个月婴儿，足月顺产，出生体重2kg，纯母乳喂养，未添加辅食。査体：皮肤、巩膜无黄染，前因平软，唇较苍白，心、肺无异常，肝右肋下3cm,脾左肋下2cm,Hb80g/L,WBC8.5x109/L,N0.38,L0.65,M0.02,RC0.05,MCV70fl,MCH25pg,MCHC0.26,HbF7%。此病儿最可能的诊断是

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