During pregnancy, both nutrients and oxygen pass from the mother's blood to the that of the fetus. by way of the placenta. When the baby is born, then the mother can provide milk (if she breast feeds).
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It passes Carbon dioxide (Unoxygenated blood), waste gases, and Urea, a type of waste product.
Mother should eat a well balanced diet with 32 ounces of milk, take her prenatal vitamins regularly.