<prompt> Feature of hemorrhagic disease of new born isProlonged prothrombin timeDefective platelet countProlonged bleeding timeProlonged thrombin time  <response>: Normal new borns are moderately deficient in vitamin K.This deficiency increases on 3rd to 5th day when, vitamin K level falls further. The serum level of vitamin K starts increasing from 13th to 15th day of life and achieves adult level at 3 months.This is normal, and does not produce any bleeding.In hemorrhagic disease of the newborn there is delay in achieving the normal vitamin K level.Clinical FeaturesVitamin K deficiency produces severe bleeding.Bleeding occurs from umbilical cord stump on 2nd3rd day after birth.Intracranial bleding and large intramuscular hemorrhages may occur.Increased prothronzbin time and increased partial thromboplastin time.TTParenteral vitamin K therapy. 