Generally speaking, constipation in pregnant women can affect the fetus by straining to defecate. First of all, if a pregnant woman is constipated for a long time, it will cause the rectum to dilate, which may compress the uterus and affect the development of the fetus. On the other hand, constipation can cause the accumulation of toxins in the intestinal tract, while when a pregnant woman strains to defecate, the pressure in the abdominal cavity increases, which may cause the fetus to suffer from hypoxia and bradycardia, or may cause the uterus to contract, inducing miscarriage in early pregnancy and preterm labor in late pregnancy. When constipation occurs during pregnancy, you can drink a glass of warm water or honey water in the morning on an empty stomach, eat some fresh fruits and vegetables, walk around more and do some pregnancy exercises to promote bowel movement.