It again depends on your age and overall fitness, but there is on average about 6L of blood in your body and common agreement is that the most important part of your blood, the red blood cells, lasts about a third of a year (so roughly 120 days). This means that your 6L of blood gets entirely replaced in 120 days. 6L/120 days = 0.05 L/day.
The answer is hence that every day, you produce about 50 mL of blood.
On from this if you donate blood it takes a person 4 to 6 weeks to completely replace all the red cells and plasma lost during donation this is why at least 8 weeks are required between donating blood.
The fetus / unborn baby of about 8lb at birth has about 441 L blood!
The making of blood changes as the baby gets older in pregnancy … At first the red blood cells are made by cells in the yolk sac, then in the liver and finally in the bone marrow .
The red cells live a little shorter in the full term infant 80-90 days!
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