When Amy Cregg was 31 weeks pregnant, a 4D ultrasound scan taken at Burnley's Babybond Ultrasound Direct Clinic showed her son Leo David Hargreaves smiling. A spokesperson for the clinic said: "Our sonographer who scanned Amy and her gorgeous baby was overwhelmed at her smiley baby throughout the entire scan. "I think we can safely say that Amy’s baby has been the smiliest baby we've ever seen". The 4D ultrasound scan showed Leo smiling Leo was born on June 30 this year and both Amy and Leo’s dad, Leighton Hargreaves, say he is constantly grinning. "Leighton and I were absolutely shocked – even the people who did my scan were amazed". “After he was born, he was always smiling even in his sleep,” Amy told Manchester Evening News. The new parents, who live in Lancashire with their five-month-old, say they have already had companies contact them to ask about the possibility of Leo modelling. Amy said they are open to the possibility but not until Leo is older. Leo is a serious smiler 4D ultrasound scans stitch together pictures taken from different angles to create three-dimensional clear images and this type of scan is becoming increasingly popular. These 3D images are then recorded on video and this results in the fourth dimension. Image via Manchester Evening News