A 3-day-old full-term baby has the following blood test results: indirect bilirubin levels - 345 memol/L, hourly increase 6.8 memol/L. The child's condition is severe. Objectively, the child presents with decreased reflexes, muscle hypotonia, and limb tremor. The blood of the child and the mother is Rh-incompatible What would be the most effective method of treatment in this case?