患儿男，3个月。纯母乳喂养，偶加鱼肝油1滴，户外活动少，有时多汗、烦躁不安。体检：前囟2.5cmx2.5cm,头颅及兵兵感，心、肺、腹正常，手足镯未触及。血生化检査结果示：血钙临界值，血磷下降，AKP上升，25-维生素D下降，PTH上升。应考虑属于维生素D缺乏性佝偻病哪一期

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