The 18th week of pregnancy can be appropriate sex life, but there are individual differences. The development of the fetus at 18 weeks of pregnancy has been relatively stable, for the more stable pregnant women, this time can be appropriate under the guidance of the doctor to have sex, but pay attention to not too frequent, the action should be gentle. But for the combination of ultrasound examination suggests that the position of the placenta is low, there are symptoms of preeclampsia and other conditions of pregnant women can not have sex. Consult your physician for specific advice. In addition, the 18th week of pregnancy has entered the middle gestation period, is the period of rapid growth of the fetus, at this time you need to increase the appropriate dietary nutrition, you can eat more food rich in protein, iron, calcium and vitamins and other nutrients, such as meat, dairy products, fish, poultry and vegetables and fruits, in order to meet the needs of the growth of the fetus. Appropriate physical exercise can also be maintained to ensure appropriate weight gain during pregnancy.