It is generally believed that 22-28 weeks of pregnancy is the best time to perform fetal echocardiography. The main reasons for this are as follows: 1. The fetal heart can basically be seen in its basic structure around 22-28 weeks, while the heart anatomy cannot be accurately identified during the early examination. 2, late examination if found serious heart malformation, will miss the best time to induce labor, bringing the family on the choice of treatment distress.