Occasional diarrhea in pregnant women does not affect the fetus. Try to pay attention to keep warm and avoid eating cold fruits and vegetables, iced drinks and meat that is too greasy to avoid frequent diarrhea. If diarrhea occurs frequently, it will easily lead to insufficient nutrition for pregnant women. The nutrients in the food are not fully absorbed, which will affect the growth and development of the fetus. Especially when diarrhea is frequent, it can easily lead to stomach pain, which may trigger uterine contractions and spasms leading to miscarriage. If diarrhea occurs, an accurate judgment should be made based on the clinical manifestations of the individual combined with the cause of the disease, and timely measures should be taken for symptomatic treatment to control the development of the disease. Generally, when diarrhea occurs during pregnancy, you can use drugs that have fewer side effects on the fetus, such as montelukast, which has the effect of astringent intestines to stop diarrhea and protect the intestinal mucosa.