Yawning is a behavior that everyone is aware of, and we all take part in it, yet no one knows the precise reason why we do it. There’s a ton of theories: A need to rapidly get oxygen into the blood, a way to remain alert for possible danger, imbalances in neurotransmitter levels, and even regulating brain temperature. None of them have been completely proven right or wrong. (from Itsokaytobesmart.com (link))

Still image from the 4D ultrasound below.

“A 4D ultrasound image shows a yawning unborn baby at 7 1/2 months of pregnancy. Researchers believe that the yawning reflects is a developmental process and could potentially give doctors another metric for evaluating an unborn baby’s health. The new research distinguished ‘yawning’ from ‘non-yawn mouth opening’ based largely on the duration of mouth opening.” (link to Youtube)

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