29/11/2013 11:07 GMT | Updated 22/05/2015 10:12 BST

The Foetus Smiling At 17 Weeks Old

Amazingly, this is the face of a foetus aged just 17 weeks old.

Professor Stuart Campbell, who took the picture at his London clinic with 3-D and 4-D scanning equipment, said it did not necessarily show the unborn child had feelings - but it was certainly displaying human behaviour.

'This is a joyful expression of the humanity of the foetus. I have seen a foetus making a crying face at around 18 or 19 weeks, but not a nice smile.

'This is the earliest on record - it is just a delight.'

Professor Campbell, former head of obstetrics and gynaecology at King's College and St George's hospitals in London, said he did not know what caused the smile.

'It is part of a sequence that involves yawning and making breathing movements and opening its eyelids and, of course, it makes a crying face.'