A 10 days old girl was hospitalized, because of lacking one day of feeding.?

A 10 days old girl was hospitalized, because of lacking one day of feeding. She had the symptoms of xanthochromia and fever for 6 hours before hospitalization. Body check showed flamboyant color in umbilical cord with and dull reaction．In routine blood test: leukemia 44.7 ×109/L，neutrophil　65％， hemoglobin　132.9g/L，total bilirubin 443.94umol/L（26.2mg/dl）， direct bilirubin 30.9 umol/L. Please make the primary diagnosis and give diagnostic evidence to this case