There are two causes of low red blood cells during pregnancy, one is due to blood dilution in the middle and late pregnancy, causing physiological low red blood cells, which generally does not require special treatment; the second is caused by anemia during pregnancy, anemia can easily make the fetus and pregnant women at risk, and requires timely treatment. 1, blood dilution: in the middle and late pregnancy, the increase in maternal plasma volume will be greater than the increase in red blood cells, resulting in physiological blood dilution, resulting in low red blood cell count low. Generally, no special treatment is needed, and appropriate nutrition can be increased; 2. Anemia: some pregnant women have serious early pregnancy reactions in early pregnancy, causing poor appetite, vomiting, or deliberate dieting and other reasons leading to malnutrition and insufficient iron intake, resulting in a decrease in red blood cell and hemoglobin synthesis, causing low red blood cell count. In this case, pregnant women should take iron supplements for blood under the guidance of a doctor, take appropriate vitamin C supplements, and have a balanced and nutritious diet, which can be improved by appropriate intake of iron-rich foods such as pork liver and spinach. Pregnant mothers should usually pay attention to rest and eat healthy, not to be picky, balanced nutrition, avoid over fatigue, avoid staying up late to protect the normal development of the fetus.