<prompt> Erythropoiesis in gestation age takes place inYolk sacPlacentaAmniotic sacChorion  <response>: In the first 2 months of gestation yolk, sac is the main site of Erythropoiesismesoblastic stage Ref: Medical Physiology Indu Khurana 2015 page No:104 In early weeks of embryonic life, primitive nucleated red cells are producedin yolk sac. During middle trimester of gestation-liver also spleen,lymph nodes in reasonable numbers During last month of gestation and after bih- exclusively in the bone marrow 