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(gentle music)

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- [Narrator] It's true.

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Now that you're pregnant,
you're eating for two,

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but how does your baby
get the nourishment?

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As you eat, your food descends
through your esophagus,

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into your stomach, and then
intestines, where it's digested,

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broken down into glucose,
fats, and proteins.

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Through digestion,

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these elements are
absorbed into your blood

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and passed through the placenta.

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The placenta is a very efficient filter.

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It rejects many but not
all harmful elements,

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such as bacteria.

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Smaller elements, oxygen,
glucose, fats, proteins,

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vitamins, and minerals can
pass through the placenta.

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After they've entered the placenta,

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these elements are passed onto the baby

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through the umbilical cord.