And his parents believe their son may be the happiest baby in Britain as he hasn't stopped smiling since.

 

The remarkable¹ image was taken from an ultrasound scan at 31 weeks.

 

His mother Amy Cregg, 24, said: 'My partner Leighton and I were absolutely shocked - even the people who did my scan were amazed.

 

'But that was just the beginning. After he was born, he was always smiling - even in his sleep.'

 

Now nearly five months old, Leo has been dubbed² the happiest baby in Britain.

 

The image is a 4D scan - increasingly popular with expectant parents to get a glimpse of how their child will look.

 

Rather then the grainy 'flat' images produced by the 2D scanners usually used by the NHS, a 4D machine stitches together pictures taken from a variety of angles to create clear three-dimensional images.

 

These are then recorded on video -- the fourth dimension.

 

Ms Clegg, from Accrington, Lancashire, said she has already had modelling companies approach her trying to capture Leo's smile.

 

The rehabilitation³ support worker said: 'I've been walking in the park and had people come up to me and say "What a gorgeous baby".

 

'I'd be interested in him doing modelling but only when he's older.'

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