system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Initial site of RBC production in fetus
assistant
The correct answer is  Hematopoiesis - 1st demonstrable in yolk sac followed by liver and then finally spleen and bone marrow life span of fetal RBCs at term - 90 days