This medical illustration diagram shows the circulation of blood within a fetus during pregnancy. The image shows colored arrows depicting oxygenated (red), deoxygenated (blue), and mixed blood (purple) circulating through the body of the baby. Clearly visible are the major vascular shunts, including the ductus arteriosus, foramen ovale, and ductus venosus. Other anatomical structures include the superior vena cava, inferior vena cava, heart, lungs, liver, abdominal aorta, portal sinus, portal vein, hypogastric arteries and vein, umbilicus, umbilical artery, and placenta.