2, but pregnant mothers need to pay attention to eating crayfish: pregnant mothers who are allergic to crayfish are forbidden to eat; Eating fresh crayfish, stale crayfish will lead to diarrhea, which may lead to premature delivery; Choose clean and hygienic crayfish for cooking to prevent parasites and microbial infection and affect the normal development of embryos; Try not to eat the head of crayfish, there may be some heavy metal accumulation in the head, which is not good for your health.