In the third month of pregnancy, there are no specific requirements for the sleeping position of pregnant women, pregnant women can choose according to their own habits, mainly to the pregnant women feel comfortable. In the middle and late stages of pregnancy, it is recommended that the pregnant woman lie on her side, especially after 28 weeks, it is recommended that the left side lying position is better, because most pregnant women’s enlarged uterus is right-handed, the left side lying position is beneficial to increase the blood volume of the placenta, increase the oxygen content of the placenta, which is conducive to the growth of the embryo. Pregnant women try not to take the supine position, supine position when the increased uterine pressure, resulting in a reduction in the amount of cardiovascular blood, so that the blood pressure drops, prone to cause supine hypotension syndrome in pregnant women, bringing harm to pregnant women and fetuses. The first trimester of pregnancy is an important period for fetal development, when adequate nutrition is needed to meet the needs of the pregnant woman and the fetus. It is also necessary to supplement folic acid to prevent fetal cerebrovascular malformations. You can eat an egg and a walnut every day to strengthen the elasticity of cerebral blood vessels and promote the vitality of nerve cells. In addition, after 3 months of pregnancy, Down’s syndrome screening and routine blood tests should be done to determine the development of the fetus in the body.