The parents of a baby from Cardiff who was given a 5% chance of survival when he was born four months early say they are overjoyed by his progress.
Kaven was born just 23 weeks into his mother's pregnancy
When Kaven Gainey was born at the University Hospital of Wales weighing 1lb 6oz (0.62kg), his parents were warned to prepare for the worst.
But after two operations, eight-month old Kaven is living at home and said to be developing well.
His story can be seen on BBC One's Hospital programme on Tuesday.
When Kaven was born at 23 weeks, he was classified as extremely premature, with a dangerously low birth weight.
Eight months on Kaven has put on weight and is developing well
His life was in danger because of a bowel infection and he was kept in hospital for five months.
Kaven's mother Victoria Simmonds said: "When I look back now I don't know how we got through it, but obviously we had to.
"We had to keep going because Kaven was obviously fighting for survival."
Ms Simmonds explained she and Kaven's father, Lawrence, had to leave the hospital about one week after the baby was born.
"It was so horrible walking out of the hospital without Kaven, but the nurses would phone me at home, and I could phone 24 hours," she said.
"Me and Lawrence could come in whenever we wanted to and they basically treated Kaven like their own child."
Kaven was finally allowed home last October, but his parents were told they may still face hurdles ahead.
They were warned by consultant Mark Drayton that as infants develop sometimes problems could emerge.
"The future's still uncertain," said Mr Gainey.
"He came home on a lot of medication and we had a lot of hazards to watch out for, and he's overcome a lot of those already.
"There's one main concern which we have. Kav may have a weakness on his left side but that's still uncertain, and only time will tell really," he added.
Hospital: Special Babies is on Tuesday 9 January BBC One Wales at 2235 GMT