In the first month of pregnancy, pregnant women can fly under normal circumstances. However, when a pregnant woman has a severe early pregnancy reaction, has had more than 2 spontaneous miscarriages, has signs of miscarriage or is suffering from a serious illness, she may not be suitable for air travel. If a pregnant woman is in good health, has no previous history of bad airplane travel, is not sensitive to noise, and has a short flight, it will not affect her or her fetus. It is recommended that pregnant women choose a position close to the aisle when flying, and get up at intervals for small movements to promote blood circulation. Pregnant women with severe early pregnancy reaction, frequent nausea, vomiting and loss of appetite are not recommended to take the plane, as the change of air pressure during take-off and landing may aggravate the early pregnancy reaction. If a pregnant woman has had more than 2 spontaneous abortions or has a small amount of vaginal bleeding with abdominal pain, it means that the fetus may be unstable at this time and the pregnant woman has a higher chance of miscarriage. The bumps and noise during the flight can induce miscarriage, so it is not recommended for pregnant women to take a flight in this case. If the pregnant woman is in congenital heart disease, severe emphysema, cerebral hemorrhage, etc., she should also be careful to choose to take the plane, once the disease attack, the plane medical conditions are limited, may not be able to timely and effective treatment, and thus endanger the safety of the pregnant woman and the fetus.