The inability to breathe is not a lack of oxygen for the fetus, but a more common condition due to fetal compression of the chest cavity. After the fetus grows and develops to a certain extent, it can compress the heart, lungs and other tissues of the pregnant woman, in this case, it may lead to the phenomenon of not being able to breathe. If this symptom occurs for a short time, less frequently, and without other obvious discomfort, there is no need to worry too much. If it is more worrying, or if the pregnant woman has frequent asthma or lack of oxygen supply, it can seriously affect the healthy growth of the fetus and may lead to fetal asphyxia and lack of oxygen, then it is recommended to seek medical attention. Usually the doctor will clarify the fetal condition through fetal heart monitoring, and if there is fetal hypoxia, the pregnant woman can be arranged to receive oxygen to ensure the healthy development of the fetus. Therefore, pregnant women should go to the hospital regularly for prenatal checkups during pregnancy and should maintain good habits in general. In case of abnormalities, then it is recommended to seek medical attention in time to pass the labor period smoothly under the guidance of obstetrician and gynecologist.