The five-year-old from Wodonga has become the face of DonateLife Week, the federal government's push to have more people sign on to the national organ donor registry.

Archer's face is on posters right across the country promoting the push, which officially begins on July 30.

He wasn't always happy being the centre of attention though.

It hasn't been easy for Archer, being caught in the middle of doctor after doctor talking about him, stuck in hospital when he should be outside.

But, as his mother Nikki Irwin says,  Archer changed his mind when he learned what the posters meant.

“He didn't like it at the start, he doesn't like the attention and people talking about him being sick all the time,” she said. “We've changed tactics a little and told him he's helping other people – he loves it now.”

Archer was diagnosed with alpha one antitrypsin deficiency, which affects his liver and lungs, when he was just three months old.

As a result, Archer requires a liver transplant, and is unable to do things like play contact sports or risk sustaining blows to the spleen or head.

“Archer has always been very wise for his age,” Mrs Irwin said.

“I knew he had too much focus on what's going on around him, unfortunately he has people talking over him and about him.

“Taking that part of it away from him has been something that's changed things completely.

“When we went around putting posters up he told me being a poster boy is really tiring.

“We've put posters up in our GP's clinic and the hospital – it's been good to turn it around and not be going to those places for treatment, but instead for something happier.”  

While it's exciting seeing Archer's face on a national campaign, Mrs Irwin doesn't want people to forget why he's there.

DonateLife Week, which is led by the Organ and Tissue Authority, hopes to increase the number of people signed up to the Australian Organ Donor Register.

Only one in three people are on the register, despite the fact that 81 per cent of Australians believe it is important to register.

“We struggled to get information out there when Archer was first diagnosed, so to have something like this, to have people talking about it, is so important,” Mrs Irwin said.

“The main thing to take from all the excitement is that you absolutely have to have that conversation with your family about what you want to do.”