<prompt> Not a site of hematpoiesis in fetus -KidneyLiverSpleenYolk sac  <response>: Ans. is a i.e., Kidney Erythropoies siteso Intrauteriney 0-10 weeksy 10 weeks - 5 monthsy 5 month onward-Yolk sac-Liver maj or organ and spleen- Bone marrowo After birthUpto 20 years - Bone marrow of all bonesAfter 20 years - Flat bones of axial skeletal and proximal end of humerus and femur. 