Pregnant women in the first and second trimesters of pregnancy are not recommended to cohabit, after the middle of pregnancy can be appropriate cohabit, but pay attention to appropriate control of frequency, action can not be rough. The first three months of pregnancy due to embryonic development is still unstable, it is not recommended to have intercourse at this time, so as not to increase the risk of miscarriage, and in the second trimester of pregnancy, intercourse can increase the risk of premature rupture of membranes, preterm labor, so these two stages are not recommended to have intercourse. The rest of the pregnancy can be appropriate coitus, should pay attention to not too frequent, the action can not be too rough, and can not be pressed to the pregnant woman’s abdomen. Mid-pregnancy to follow the doctor’s advice to increase the appropriate protein, calcium, iron and vitamins and other nutrients in the food, such as eggs, dairy products, meat and poultry, fish and so on. Also under the guidance of the doctor to ensure appropriate physical exercise, such as walking, pregnancy yoga, etc., so that the appropriate weight gain, conducive to the natural delivery of late pregnancy.