Common site of haematopoiesis in fetus is -
Blood cell progenitors first appeared during the third week of embryonic development in yolksac.But its contribution is only transient. During 3rd month of embryogenesis hematopoetic stem cells migrate to liver which becomes the chief site of blood cell formation until sholy before bih. Reference :Robbins and Cotran Pathologic basis of disease.South Asia Edition-9 volume 1.page no. 414
Liver
Spleen
Bone marrow
Gut
Haematology