Edema in pregnancy has nothing to do with the sex of the fetus. It may be caused by the enlarged uterus compressing the inferior vena cava in late pregnancy, or it may be caused by high blood pressure and heart disease during pregnancy. 1. Obstruction of venous return: During pregnancy, edema in pregnant women is not related to the sex of the fetus, because the sex of the fetus is determined by the sex chromosomes. In late pregnancy, as the fetus and the uterus gradually increase in size, it will exert pressure on the veins of the pregnant woman, causing obstruction of venous return, which will lead to the occurrence of edema. 2. Gestational hypertension: edema during pregnancy may be a symptom of gestational hypertension, in addition to foam in the urine, headache and blurred vision. 3. Heart disease: edema during pregnancy may be the cause of heart disease or cardiac insufficiency, which should be actively dealt with. There may be other reasons why a pregnant woman develops edema during pregnancy. If accompanied by other symptoms, or edema is serious, it is recommended to go to the hospital in time.