The data will be stored in the attached worksheet and analyzed using statistical methods to compare the results of laboratorial exams and the presence or absence of exchange transfusion during hospital stay among those children who were given intravenous immunoglobulin and those that were not. These tests will take into consideration that the sample has been randomized in blocks. The observations will also be conducted by stratifying both groups, as follows: premature babies, non-premature babies, babies that underwent intra-uterus transfusion and those that did not. The data will be examined by the statistical program SPSS 13.0, using the appropriate tests for quantitative and binary variables.