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Having a yawn

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Uploaded by on Jun 19, 2006

4D scan of Rhian and Dermot's unborn baby boy at 29 weeks.

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  • The feotus' lungs are filled with amniotic fluid and they do not breath until they are fully out of the mother. This is not an actual gasp for extra oxygen, but unborn babies practice all sorts of actions. No one is quite sure exactly why the feotus yawns, but it is linked to sleep and associated behaviors in the brain.

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