All newborns included in the study will be granted with conventional supplementary treatment that includes the indication of exchange transfusion and of phototherapy, according to specific criteria recommended by the American Academy of Pediatrics in 2004. The criteria apply equally to both groups. The study will be monitored individually and it will be allowed to be interrupted it if any important side effect occurs such as anaphylactic reaction or if the results of a given group are significantly better than those of the other before the inclusion of new subjects in the research, according to the size of the sample or in case the drug does not yield the desired beneficial effects.