4D scans show fetuses yawn in the womb

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A 4D ultrasound scan shows a foetus yawning in the womb during a study by Durham and Lancaster Universities and released in Durham, northern England November 21, 2012. Growing into a fully formed human being is a long process, and scientists have found that unborn babies not only hiccup, swallow and stretch in the womb, they yawn too. Researchers who studied 4D scans of 15 healthy foetuses also said they think yawning is a developmental process which could potentially give doctors a new way to check on a baby's health. REUTERS/Dr Nadja Reissland/handout