Patient's question:
Fetus at 39 weeksDoctor's answer:
The fetus primarily completes its main metabolism through the circulatory system within the uterus. Therefore, in the uterus, there are many normal cavities in the fetal heart blood flow (which would be abnormal if they remained open for a long time after birth), such as the ductus arteriosus, atrial septum, and ventricular septum, etc. These are all normal in the uterus. After the fetus is born, with the onset of pulmonary respiration, the cardiac circulation also gradually changes. These cavities can naturally close within 6 months to a year.