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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.
Bleeding after birth guide: What to expect. 1  Bleeding one day after the birth. 2  Bleeding two to six days after the birth. 3  Bleeding seven to 10 days after the birth.  Bleeding 11-14 days after having a 1  baby. Bleeding three to four weeks after having a baby.  Bleeding around six weeks after having a 1  baby. Further information.