Factor X deficiency: An overlooked cause of bleeding in the newborn

Inherited factor X (FX) deficiency is a rare autosomal recessive bleeding disorder, presenting with various bleeding manifestations ranging from nonspecific bruising to life-threatening intracranial hemorrhage. It is often misdiagnosed as hemorrhagic disease of the newborn. It is characterized by prolonged prothrombin time, as well as activated partial thromboplastin time, and needs FX level assay for definitive diagnosis. Here, we describe a case of a newborn with FX deficiency who presented with frank umbilical stump bleeding.