求翻译：因为怀孕后她们体内的血红蛋白会增加20%，另外，准妈妈还需要为胎儿储备出生后1～4个月所需的铁，因此对铁的需求量也会相应增加。是什么意思？

Because their body after pregnancy, hemoglobin will increase by 20%, In addition, mothers also need to reserve for the fetus after birth, required 1-4 months of iron, so the demand for iron will increase accordingly.

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Because after is pregnant their in vivo hemoglobin to be able to increase 20%, moreover, accurate mother also needs to stockpile for the embryo is born the iron which the latter 1~4 month institute needs, therefore also can increase correspondingly to the hard demand.

Hemoglobin because their body after pregnancy can increase 20%, and mother also need 1-4 months of birth required for fetal reserves of iron, and hence will be more demand for iron.

Because their body after pregnancy, hemoglobin will increase by 20%, In addition, mothers also need to reserve for the fetus after birth, required 1-4 months of iron, so the demand for iron will increase accordingly.