The objective of this study is to use of STIC technology to assist the traditional echocardiography to diagnose the fetal congenital heart disease accurately and then to provide a basis for prenatal counseling.

This is a diagnostic test in Shanghai Xinhua hospital from Nov.2016 to Dec.2017. 265 Cases are gravidas with fetal congenital heart disease diagnosed by echocardiography.Only gravidas who are willing to have complete pregnancy checks and finally delivery or abortion in the hospital are interviewed are eligible for the study. Study participants will be asked for their informed consent.We collect their fetal 2D echocardiography and STIC images every 4-6 weeks during pregnancy and 1 weeks after the baby giving birth we finish their neonatal echocardiography.

Inclusion Criteria:

1. Gravida with singleton pregnancy taking fetal echocardiography.
2. No virus infection or drug use history, no harmful substances in the early pregnancy.
3. Complete pregnancy check in the hospital, and finally delivery or abortion in the hospital.
4. On the basis of informed consent，willing to cooperate with our group.

Exclusion Criteria:

1. Elderly pregnant women (>35 years old)
2. Twin or multiple pregnancy
3. Pregnant women suffering from mental illness, can't take care of themselves.
4. Fetus diagnosed with other abnormalities (except congenital heart defects)

Gravidas with singleton pregnancy living in SHANGHAI