晚发性维生素K缺乏症多见于3个月以内的婴儿,其中30～40d患儿可占55％。我科于1998年6月至2000年10月共收治25例,现报告如下: 1 临床资料 1.1 一般资料:男17例,女8例。发病年龄:20d～1M5例,～2M12例,～3M2例。其中母乳喂养20例,混合喂养5例。起病后5小时～2天入院。病前曾有上感史5例,腹泻史2例,黄疸史3例。 1.2 临床表现:均有进行性面色苍白,前囟饱满20例,呕吐16例,烦躁拒乳10例,瞳孔不等大6例,呼吸不规则5例,不规则发热5例,神志不清3例,抽 Late onset vitamin K deficiency more common in infants within 3 months, of which 30 ~ 40d children accounted for 55%. Our department from June 1998 to October 2000 were treated 25 cases, are as follows: 1 Clinical data 1.1 General information: 17 males and 8 females. Age of onset: 20d ~ 1M5 cases, ~ 2M12 cases, ~ 3M2 cases. Among them, breast-feeding in 20 cases, mixed feeding in 5 cases. 5 hours after onset ~ 2 days admission. There had been a sense of illness before the disease in 5 cases, history of diarrhea in 2 cases, history of jaundice in 3 cases. 1.2 Clinical manifestations: both progressive pale, full of anterior fontanel in 20 cases, vomiting in 16 cases, irritability, breast rejection in 10 cases, ranging from 6 pupils, irregular breathing in 5 cases, 5 cases of irregular fever, confusion 3 Example, pumping