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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.
Healthy babies with a normal nervous system can move smoothly from one state to another. Heart rate, breathing, muscle tone, and body movements are different in each state. Many bodily functions are not stable in the first months after birth. This is normal and differs from infant to infant.