This is a 3D model presenting normal cardiac anatomy at 20 weeks of gestation in sagittal sections. This model shows all representative views including long axis caval view, aortic arch view, ductal arch view, short axis of the ventricles view. Our model may be used on-line (with the presence of the patient) at the time of fetal cardiac evaluation in order to understand the mutual geometry of the segments and particular elements constituting normal cardiac anatomy. This can be applied at any time, only if the fetal heart points with the cardiac axis to the left on the screen of the ultrasound scanner. Horizontal flip of the ultrasound image is required when the fetal heart points with its axis to the right on the screen. Our model is easy to use for the off-line learning (without the presence of the patient) by relating axial cardiac views demonstrated by means of video clips, still images or schematic drawings from textbooks or publications.