Generally speaking, it is better to take the left side sleeping position in the middle of pregnancy. Left-side lying can reduce the pressure of the uterus on the arteries and kidneys of the pregnant woman, which can maintain the normal blood flow of the uterine arteries and thus ensure the blood supply of the fetus. The left side can also reduce the compression of the uterus on the veins, thus increasing the blood flow back to the heart, which can also improve the blood supply to the brain tissue and help to reduce the hypertension of pregnant women. Therefore, it is recommended to take the left side of the bed in the middle of pregnancy is better, not only to take the left side of the bed, in the middle of pregnancy should also choose a comfortable bedding, as well as a good indoor environment. Because the fetal growth and development is faster in the middle of pregnancy, the demand for nutrition for pregnant women is also more, so it is recommended to take the left side of the bed, and usually pay attention to eat more fresh fruits and vegetables.