The main hazards of combined anemia in pregnancy are as follows: 1. After anemia, the body’s resistance is weakened, so the chance of infection during pregnancy increases, and the ability to tolerate anesthesia for childbirth surgery decreases; 2. Because of the reduced resistance of women during pregnancy, they are more likely to have puerperal infections after delivery; 5. Due to anemia, the mother’s oxygen and nutrient supply to the fetus through the placenta is insufficient, so it is more likely to cause fetal growth restriction, distress, preterm delivery and even stillbirth, so it will also have certain effects on the fetus in the long term.