文档介绍：Anemia in childhood (小儿贫血)
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Disease of hematopoietic system
infantile anemia
（1）nutritional iron deficiency anemia(IDA)
（2）nutritional megaloblastic anemia
Primary/immunity thrombocytopenia Purpura(ITP)
Leukemia
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haematogenesis of children
hematopoiesis --produced blood
extramedullary
 before birth and postnatal
 
mesoblast hepatic medullary
3-15w 6w-6ms 3ms
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Embryo stage
Mesoblastic haematogenesis：3ws begin，8ws weaken, 12-15ws disappears。
liver：8ws begin，6months gradually weaken ,erythroblast、granular cell and megakaryocyte.
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Embryo stage
3、spleen：12ws begin erythrocyte, granule ,
lymphocyte
4、Haematogenesis of lymphatic organ
gland:8ws nodes:11ws
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Embryo stage
5、myelo-haematopoiesis：6mons
Haematogenesis function emphasis，make various kinds of blood cells，unique hematogenic organ after birth.
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Haematopoiesis postnatal
1、marrow：
2、extramedullary：when requirement of haemopoiesis increase，liver、spleen、lymphadenectasis，hepatomegaly and splenomegaly, in circulating blood
immature erythrocytes and granulocytes .
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Physiological haemolysis
Normal newborns have higher hemoglobin(HB) and hematocrit levels and a shortened survival period of the fetal RBCs contributes to the development of physiologic anemia.
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