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We already know that unborn babies can stretch and even hiccup in the womb, but new research from the University of Durham concludes that they can also yawn. There has long been debate about whether foetuses really are capable of yawning, or whether they are just opening their mouths.
As part of a study published in the international journal PLOS ONE, researchers looked at 4D scan footage of 15 healthy foetuses and examined how long their mouths stayed open for. Using their newly developed criteria, the research team found that over half of the mouth openings observed in the study were classed as yawns.