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When you are pregnant you have to make more blood to supply the growing uterus, placenta and baby. However the production of red blood cells cannot keep up with the production of liquid blood and therefore your hemoglobin drops. Most well-nourished women have ample capacity and won't become anemic, but if a woman is teetering on the edge of anemia, pregnancy can push her over. However the body has a wonderful mechanism and the most important parts (brain and baby) always get sufficient blood/oxygen. Also the blood loss at delivery seems to be very liquid and many women who have a low Hb prior to delivery seem to have a higher one afterwards. Not to minimise the dangers of anemia and/or blood loss you understand.

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Q: What is physiological anaemia of pregnancy?
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