Bleeding in the stool during pregnancy is caused by diseases such as enteritis, hemorrhoids, anal fissures, intestinal tumors, etc. The amount of bleeding in this case is not very large and will not affect the growth and development of the fetus and will not lead to fetal arrest. In case of bleeding in the stool, the first thing you should do is to distinguish the cause and treat it to control the condition to avoid affecting the growth and development of the fetus. If the bleeding is caused by a bacterial infection, it should be treated promptly with anti-inflammatory drugs that do not affect the fetus. If the bleeding is caused by hemorrhoids or anal fissures, eat more fruits and vegetables to ensure the smooth flow of stool and reduce the chance of bleeding. If the bleeding is recurrent, further gastroscopy should be performed to identify the cause. Heavy bleeding can easily lead to anemia in pregnant women, which can also affect the growth of the fetus.