When a blood test was performed on Cindy's fetus, the doctors found some of Cindy's red blood cells in the fetus' circulatory system. We know that this most likely

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The placenta is responsible for providing nutrients and oxygen to the fetus while filtering out waste products. The placenta should also block the mother's red blood cells from entering the fetal circulatory system, as these cells can trigger an immune response in the fetus. The presence of Cindy's red blood cells in the fetus' circulatory system suggests that the placenta is not functioning properly and may be allowing maternal-fetal blood mixing. This can lead to hemolytic disease of the newborn, a condition where the mother's antibodies attack the fetus' red blood cells, causing anemia and other complications.

When a Blood Test Was Performed on Cindy's Fetus, the Doctors