A four-month-old toddler, Finley Burton, whose condition went critical following a heart surgery was put to chilling in the hospital, as the doctors attempted to save his life.

After the surgery, Finley heart beats increased to 200 times per minute, which could have proven fatal.

The baby boy had a hole in his heart. He underwent a surgery in May.

As the increase in his heart beat was recorded, the doctors chilled him to reduce the temperature of his body by at least 3°C. He was then tranquilized. A pacemaker was connected to his body which helped in measuring the heartbeat.

The baby has now been reported to be improving in Easington Colliery, County Durham.

He was treated by the surgeons at Newcastle's Freeman Hospital, who put him in a blanket filling in chilled air. He was kept there for at least four days.

Finley's parents suspected the problem when the toddler showed no gain in his weight after growing 10 months in age.

According to the University Hospital of North Durham, the baby suffered a congenital heart condition leading to breathlessness and fatigue.

“Now he's doing really well and has already put on lots of weight”, said Ms. Link-Emery.