In Erythroblastosis fetalis, the first child is spared because:: (A) Immune response in second exposure is fast, (B) Sensitization of Rh-negative mothers by a Rh-positive fetus generally occurs at bih, (C) Small amounts of fetal blood leak into the ma ternal circulation at the time of delivery, (D) Mothers develop significant titers of anti-Rh ag glutinins during the postpaum period
Answer is B. Sensitization of Rh-negative mothers by a Rh-positive fetus generally occurs at bih