A nine-month-old UK baby survived against all odds after doctors stopped his tiny heart for 15 hours.
Nathan Byrne, who was born with a large hole in his heart and faced certain death, has survived a marathon surgery.
Byrne is now the smiling picture of health, British media reported on Monday.
Without complex surgery, which saw his thumb-nail sized heart stopped for 15 hours, he would not have lived beyond six months, Scottish newspaper 'Daily Record' reported.
Surgeons told parents, Lesley Condie and David Byrne, Nathan would be in surgery for seven hours, but complications saw the procedure take more than double that time.
A remarkable fight for life followed countless complications, but the youngster, who spent time on a life support machine, has amazed medics and his family.
Mum Lesley, 28, told media, "To look at him, you would never know what he's been through. He has so much energy and never stops smiling. It is amazing he still does that, considering all that he has been through."
Nathan had a rare condition called tetralogy of fallot - which also causes a narrowing of the the pulmonary artery. Every time doctors tried to take the tot, then three-and-a- half-months-old, off the machine that kept him alive during surgery his heart and lungs stopped working.
To give his organs a chance to recover Nathan was attached to a machine that circulated his blood outside of his body.
The baby also had to be starved for 10 days after an infection left his bowel on the verge of busting.
Nathan also had to contend with blood clots on his brain, which caused countless seizures lasting between four and 45 minutes.
When Nathan went into surgery he was so ill that his parents were told not to leave.
(With agency inputs)
