What does a mother who is Rh- receive to prevent sensitization for her second Rh+ baby?

• A. Folic acid
• B. AntiRh antibodies
• C. Iron supplements
• D. Vitamin K

Answer: (B)

A mother who is Rh- receives anti-Rh antibodies, specifically a medication called Rho(D) immune globulin, to prevent sensitization for her second Rh+ baby. This treatment is crucial because if an Rh- mother carries an Rh+ fetus, her immune system may recognize the Rh factor (a protein present on red blood cells) as foreign. If sensitization occurs during the first pregnancy or a subsequent delivery, the mother's body can produce antibodies against Rh+ blood cells. These antibodies could cross the placenta in a subsequent pregnancy, potentially leading to hemolytic disease of the newborn (HDN), a condition that can cause severe anemia or other complications in the new baby.

By administering anti-Rh antibodies, the mother's immune response is suppressed, preventing her body from producing its own antibodies against the Rh antigen. This intervention helps ensure that her next Rh+ baby is protected from the harmful effects of maternal antibodies. The correct choice highlights the role of this treatment in safeguarding future pregnancies from complications associated with Rh incompatibility, making it a vital aspect of prenatal care for Rh- mothers.