Firstly, the occurrence of anemia during pregnancy is very common, and most cases are mild anemia, but a small proportion can be severe. The harm of anemia comes from two aspects: one is that it is harmful to the fetus, as anemia during pregnancy can affect the intellectual development of the fetus, which is very clear. Another harm comes from the mother, such as the possibility of postpartum hemorrhage or infection. If a cesarean section is performed, our hemoglobin must not be lower than 80 grams. If it is below 80 grams, a blood transfusion or intraoperative blood preparation is needed.