晚发性维生素 K 缺乏症又叫获得性凝血酶原复合体缺乏症、婴儿原发性维生素 K 缺乏症、维生素K 依赖因子缺乏症等。我院近年来收治该症3例,其中2例致颅内出血,有1例合并脑疝,现报告如下。例1,女,56天,足月顺产,单纯母乳喂养。生后一直泻不消化稀便,近月来皮肤发黄,3天前神萎、呻吟、喷射状呕吐,收入我院(入院前未 Late onset vitamin K deficiency, also known as acquired prothrombin complex deficiency, primary vitamin K deficiency in infants, vitamin K-dependent deficiency and so on. In recent years, our hospital admitted to the disease in 3 cases, of which 2 cases of intracranial hemorrhage, a case of merger hernia, are as follows. Example 1, female, 56 days, term full-term, breastfeeding exclusively. After diarrhea diarrhea loose stools, yellow skin in recent months, 3 days ago, Shen Wei, moaning, jet-like vomiting, income in our hospital (before admission