Six-year-old defies the odds after being born with just two per cent of his brain

When Shelly Wall discovered she was pregnant with her third child, she and husband Rob Wall were faced with a tough choice.

Their baby boy was showing on scans to have only two per cent of his brain.

Doctors gave them a long list of physical and mental disabilities their baby was likely to have as a result, and they were offered termination on multiple occasions.

Now, six years later, they have appeared on breakfast TV with their son Noah, who has defied the odds to grow 80 per cent of his brain after birth.

Explaining their choice, Rob says the parents to two older girls, were optimistic all would be well with Noah.

"We were older parents, if younger people were offered that choice they may have felt pressured to go through with it, but we know our own minds and we are positive people," he said on Good Morning Britain.

Noah was diagnosed with congenital hydrocephalus - caused by the spina bifida he was also diagnosed with in utero - a build up of fluid on the brain, which can damage it.

"The day he was born was amazing. We waited with baited breath," Shelly recalled.

The mum-of-three added that when Noah let out a big scream as he was born, they let out a big sigh of relief.

Speaking of how far their son has come over the past six-years, Rob said: "It's a very emotive subject. Some people say you can't grow a brain.

"Other people say it must have always been there. But if it was and squashed up it would have been so severely damaged he would have been very mentally and physically disabled."

Next, the wheelchair-bound Noah is hoping to learn to walk and is undergoing neurophysics therapy - a combination of physiotherapy and cognitive exercises - in Australia at a radical brain training centre.

The six-year-old even hopes to learn to surf one day.