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This is a good question! Fetus gets the oxygen from the placenta. In case of the placenta, the blood from the mother and fetus comes in contact with each other. Here both the bloods are not mixed up and separated by thin membrane. Fetus needs very high quantity of the oxygen for the growth. So fetus has got more hemoglobin to extract more oxygen from the blood of mother. After the birth, this extra hemoglobin diminishes with time.

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10y ago

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