Gynaecology & Obstetrics 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 💡 Explanation In Erythroblastosis fetalis, the first child is spared because: ✓ Correct Answer: B. Sensitization of Rh-negative mothers by a Rh-positive fetus generally occurs at bih