Eating crayfish in small quantities during pregnancy generally has no effect, but it should not be consumed frequently and in excess. Diet during pregnancy to ensure a reasonable and balanced to ensure that the mother’s intake of adequate nutrition to meet the development of the fetus and the mother’s own needs. Crayfish is rich in protein, calcium, trace elements (iron, zinc, etc.) and other nutrients, a small amount of consumption can provide nutrients for pregnant women themselves and the fetus. However, it should not be consumed frequently and in excess to avoid causing acute gastrointestinal reactions such as diarrhea. Diet during pregnancy should be healthy and nutritious, consume more fresh fruits and vegetables, and ensure the intake of high-quality protein, such as fish, milk and so on. Also pay attention to appropriate rest, avoid engaging in heavy physical labor and strenuous exercise, smooth pregnancy can be maintained under the guidance of the doctor a moderate amount of physical activity, can control the weight of the appropriate growth.