Fetal Echocardiogram Treatment in India. Fetal echocardiography is almost as same as ultrasound. This procedure is used to see the functioning and structure of the unborn baby's heart. This procedure is generally used in the second month of pregnancy (18 to 24 weeks). Fetal echocardiography is the name of the test used to diagnose cardiac conditions in the fetal stage. Cardiac defects are amongst the most common birth defects. Their diagnosis is important in the fetal stage as it might help provide an opportunity to plan and manage the baby as and when the baby is born. Not all pregnancies need to undergo fetal echo.