A 4 days old on top feed brought to SNCU with c/o bluish vomiting. He was admitted after few hours he had haemorrhagic gastric lavage.

PT 15.7, INR 1.13, Prothrombin Control 13.5, APTT 35.2, Ratio 1.15, control 30 ,CRPB 3.6, platelets 2.5. What could be the possible cause of bluish vomiting?