Level 1: Why do pregnant women get diarrhea when they drink milk? It is very common for pregnant women to drink milk, but sometimes diarrhea occurs. This may be because the pregnant woman\’s body is intolerant to lactose, resulting in lactose being unable to be digested and absorbed, causing diarrhea. In addition, some pregnant women may be allergic to the protein in milk, which can also cause digestive discomfort. Level 2: How to prevent pregnant women from having diarrhea after drinking milk? First of all, pregnant women should try to choose low-lactose options