Feature of hemorrhagic disease of new born is –
Prolonged prothrombin time
Defective platelet count
Prolonged bleeding time
Prolonged thrombin time
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 Features

Vitamin K deficiency produces severe bleeding.
Bleeding occurs from umbilical cord stump on 2nd/3rd day after birth.
Intracranial bleding and large intramuscular hemorrhages may occur.
Increased prothronzbin time and increased partial thromboplastin time.

T/T

Parenteral vitamin K therapy.