A member asked:

When human bone start to produce blood ?

A doctor has provided 1 answer

Before birth: A newborn baby's bone marrow has already been actively producing blood cells. The fetal hemoglobin (the type of hemoglobin the baby makes before birth) stops being made after the baby is born, and his bone marrow continues to make blood cells... But the red cells will be made with his "adult" or non-fetal hemoglobin type.

Answered 2/25/2014

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