A vitamin K deficiency is one of the most common causes of increased bleeding associated with disorders of coagulation path of hemostasis in newborns and children of first year of life. Coagulopathy is a manifestation of vitamin K deficiency by the time of birth or due to secondary causes. In the latter case, we should not forget about the more rare causes of vitamin K dependent coagulopathy in children. As an example, the article presents the case of a patient at 6 month of age with intracranial hemorrhage on the background of the secondary deficiency of vitamin K. The child had severe coagulopathy, recurrent course за the disease and resistance to oral therapy with menadione sodium bisulfite, which led to the idea of the presence of secondary coagulopathy. After carrying out the targeted sequencing the child was revealed with pathological changes in the gene ABCB11, which are described in the 2nd type of familial syndrome of intrahepatic cholestasis, established the true reason for the deficiency of vitamin K was established. The girl’s therapy was optimized, by which clinical and laboratory manifestations of hemorrhagic disease of newborns were leveled.

Thus, a comprehensive examination of children with recurrent bleeding associated with vitamin K deficiency due to unclear etiology can indicate the true cause of the disease.