ELI5- why do babies don’t drown in the womb when they are covered by liquid in the womb?
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They get all the oxygen they need through their belly buttons!!!
Blood from the baby flows out through the belly button, along the umbilical chord, around the placenta, where it comes in close contact with the mum’s blood.
The two systems swap all sorts of things, with waste materials going out into the mum’s blood, and food and oxygen coming in to the babies blood.
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