Pregnancy
Heart Disorders See All Blood Circulation in the Fetus and Newborn in Heart Disorders During pregnancy, the fetal lungs are not used for breathing - the placenta does the work of exchanging oxygen and carbon dioxide through the mother's circulation. With the first breaths of air the baby takes at birth, the fetal circulation changes. ...more Patent Ductus Arteriosus (PDA) in Heart Disorders Patent ductus arteriosus (PDA) is a heart defect found in the days or weeks after birth. Read on to learn about symptoms, diagnosis, and treatment options.