![]() This is one of the many things your baby's pediatrician will be looking for on those newborn exams. ![]() The baby's circulatory system is different after birth than before birth, so sometimes congenital heart defects aren't apparent until a few hours or days of life. After their first breath, your baby makes the amazing transition to getting oxygen from their own lungs instead of from you and the placenta. This is a connection between the right heart circulation and the aorta that also allowed oxygenated blood to bypass your baby's lungs before birth. The ductus arteriosis also closes at birth. The sections of this tube will go on to form all the structures of the future heart. The two tubes fuse and blood flows through this tubular "heart" as it begins to beat. Two heart tubes have formed in the embryo. Your baby's heart develops from early in pregnancy through – and even after – birth. Key milestones in fetal heart development They can order special ultrasounds to monitor the development of your baby's heart.
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