<prompt> Life span of neonatal RBC -60-90 days90-120 days120-150 days150-200 days  <response>: Ans. is a i.e., 60-90 days o Life span of neonatal RBCs- 60-90 days,o Life span of RBCs of premature newborn- 30-50 days.o Life span of RBCs in older children- 100-120 days.o Life span of adult RBCs- 120 days. 