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1.Blood volume: immediately after birth averages about 300ml. (75mL additional blood from umbilical cord â if itâs still attached) But the fluid is lost into the neonateâs tissue spaces again - 300mL maintained. 2.Cardiac Output: in average 500ml/min.
Review of respiratory changes and other changes at birth. Overview.  As soon as the baby is born, the foramen ovale, ductus arteriosus ductus venosus and umbilical vessels are no longer needed.  The sphincter in the ductus venosus constricts, so that all blood entering the liver passes through the hepatic sinusoids.