After obtaining the free and informed consent from the parents, the sensitized newborns will be randomized in 2 groups, in a 1:1 proportion. The study group will receive Human Immunoglobulin (Immunoglobulin® - 50mg/ml) with a dose of 500mg/kg, equivalent to 10ml/kg during the initial 6hours of life, through intravenous infusion for 2 hours; the control group will receive the same volume in saline solution at 0.09%.