You still need to have a heart ultrasound after having a four-dimensional. 1. four-dimensional is also often referred to as four-dimensional ultrasound examination: generally between 24-28 weeks of pregnancy examination, is mainly to check the fetal limbs, face and internal organs of the examination, four-dimensional ultrasound examination is a certain limitation, for the small cardiac malformations and developmental anomalies, such as fingers and toes, generally can not be detected. 2. Fetal heart ultrasound: generally checked between 20-24 weeks of pregnancy, is a way to determine whether the fetus suffers from congenital heart disease. It can help to understand the size of the fetal heart chambers, the opening and closing of the atrioventricular valve and the opening of the bicuspid and tricuspid valves, the kinetic changes in the direction of blood flow and the speed of blood flow. It assists in the diagnosis of most of the congenital cardiac malformations in the fetus, such as endocardial cushion defects, tetralogy of Fallot, aortic territories and cardiac tumors. To sum up, a four-dimensional ultrasound examination is still needed for cardiac ultrasound examination, and it is recommended to visit the Obstetrics and Gynecology Department of the local hospital during the appropriate week of pregnancy to have an examination to understand the development of the fetus.