患兒,10個(gè)月。母乳喂養(yǎng),未添加輔食。近來發(fā)現(xiàn)食欲不振,面色萎黃,唇甲色淡,形體消瘦,大便偏稀,舌淡苔白,指紋淡紅。查血:HGB96g/L,RBC3.3×1012/L。辨證為()