Pediatric cardiology has changed greatly in a few decades, along with the spread of prenatal diagnosis of congenital heart disease (CHD). The improvement of prenatal detection rate and its accuracy resulted in optimal outcomes after birth. However, the detection rate has been still low in some CHDs, such as isolated total abnormal pulmonary venous connection. In the future, increasing the detection rate of these CHDs will be a challenge. Proper neonatal management based on fetal diagnosis and fetal intervention is also an issue to be addressed. Fetal catheter intervention is an emerging field in Japan, and it is necessary to identify the appropriate patients and confirm the safety and efficacy of this treatment. This review article describes the basics of fetal diagnosis, echocardiography, and fetal intervention, based on the author’s experience, research, and previous articles. We hope that this article can help you in your practice.