Pregnant women in early and late pregnancy, that is, within 13 weeks of pregnancy and after 28 weeks of pregnancy are not suitable for air travel. Because in early pregnancy, the embryo is unstable, the pressure brought by the fluctuation of the airplane up and down may appear subchorionic hemorrhage, leading to preeclampsia or even inevitable abortion, and in the 5-10 weeks of pregnancy is the sensitive period of embryonic development, the main appearance and internal structure of the embryo are developing in this period, easy to be affected by the influence of internal and external environmental factors and damage, resulting in the form of the body and internal organs of the deformities; and after the late stage of pregnancy, the pregnant woman After late pregnancy, pregnant women’s blood is highly coagulated, the cabin space is narrow, the range of activities is limited, long time sitting in the airplane will increase the risk of venous thrombosis in both lower limbs of the pregnant women, and late pregnancy rupture of membranes, placenta previa and other late pregnancy complications are prone to occur, the airplane flight, if there are emergencies, pregnant women can’t get timely diagnosis and treatment, delaying the condition, jeopardizing the safety of mothers and babies. If you are a high-risk pregnant woman, it is recommended that you assess the risk of air travel under the guidance of a medical specialist when you need to take an airplane during any period of pregnancy due to special circumstances.