1 病因与发病机理本病病因是维生素K缺乏.与下列因素有关:①孕母维生素K通过胎盘量较少,胎儿肝内储存量低;②新生儿出生时肠道无细菌,维生素K的合成少;③母乳中维生素K含量仅为15μg/L(牛乳为60μg/L),故母乳喂养的初生儿多见;④婴儿有先天性肝胆疾病或慢性腹泻者,影响肠粘膜对维生素K 1 Etiology and pathogenesis The cause of this disease is the lack of vitamin K. And the following factors: ① pregnant mother vitamin K through the placenta less fetal liver storage capacity is low; ② neonatal intestinal bacteria without vitamin K synthesis Less; ③ breast milk vitamin K content of only 15μg / L (milk 60μg / L), so more common in infants born breastfeeding; ④ infants with congenital hepatobiliary disease or chronic diarrhea affect the intestinal mucosa of vitamin K