A new type of ultrasound scan has produced the vivid pictures of a 12 week-old foetus "walking" in the womb.
The new images also show foetuses apparently yawning and rubbing its eyes.
The scans, pioneered by Professor Stuart Campbell at London's Create Health Clinic, are much more detailed than conventional ultrasound.
Professor Campbell has previously released images of unborn babies appearing to smile.
He has compiled a book of the images called Watch Me Grow.
Conventional ultrasound, usually offered to mothers at 12 and 20 weeks, produces 2D images of the developing foetus.
These are very useful for helping doctors to measure and assess the growth of the foetus, but convey very little information about behaviour.
The images have shown:
From 12 weeks, unborn babies can stretch, kick and leap around the womb - well before the mother can feel movement
From 18 weeks, they can open their eyes although most doctors thought eyelids were fused until 26 weeks
From 26 weeks, they appear to exhibit a whole range of typical baby behaviour and moods, including scratching, smiling, crying, hiccoughing, and sucking.
Until recently it was thought that smiling did not start until six weeks after birth.
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