COMPARISON OF OUTCOME OF HYPOXIC ISCHEMIC ENCEPHALOPATHY MANAGED WITH COMBINATION OF MAGNESIUM SULPHATE AND MELATONIN VERSUS MAGNESIUM SULPHATE ALONE Participants of group A will have 3 doses of MgSO4 infusion at rate of 250mg/kg per day intravenous over 1hour on day 0,1,2 Participants of group B will have 5 doses of Melatonin 10mg/kg for 5days along with MgSO4. They will undergo reassessment of arterial PH and serum LDH after completion of therapy. They will be followed for length of hospital stay and time until feed is initiated.