Hallow Dear, Did you get the injection of antigammaglobulin after the first delivery? If you have taken, the chances of this pregnancy getting affected are very low. However, if you have not taken the injection, this pregnancy may be affected by Rh incompatibility. Of course if the child was Rh -ve, the chances of immunization are almost nil. Please give your detailed history to the treating Obstetrician. Before you become pregnant, your antibody titre against Rh antigen will be tested and accordingly you will be advised about becoming pregnant. Also during pregnancy, the antibody titre will be tested and if it is high, depending upon the values, the baby may have to undergo some treatment while in utero - may be the blood transfusion for the baby could be required. After delivery, if the baby develops jaundice on the first day of life, it indicates that the baby s red cells are getting destroyed by the Rh antibodies and then it may require exchange blood transfusion. Severity of the events depend upon the titre of Rh antibodies in your blood. I hope this simplified version of very complicated scientific details will guide you for your future pregnancies. Wish you the best of the luck!