after birth, your baby will breathe lead to increase the amount of blood up the lungs. When the blood flows to the lungs increases, the blood will fill the left atrium, left atrium pressure will make the oval hole closed.and in aortic tube also shrink. in the fetus were products of the left ventricle, the minimum of the ventricle and the aorta does not develop were narrow, left ventricle does not meet the volume as well as functional pump blood throughout the body. When in pregnancy, blood from the lungs to the left atrium to the left ventricular down but aren't forced to flow through the oval holes to get into the right atrium into the blood to be pumped to go into the pulmonary artery. then the blood goes into the tube to pump the arteries all over the body. after birth according to the mechanism of normal arterial duct and oval holes will close gradually to completely after a few days the baby was born. at this time the blood go feed the severe lack of body can influence to life.
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