Paul Field lost his baby daughter Bernadette almost 30 years ago, but the pain of her death has never left him.

Part of the band The Cockroaches, he was touring Queensland with brothers and bandmates Anthony and John at the time his second child died suddenly in her sleep.

Only hours before, he heard his eight-month-old daughter mutter the words "ta ta" on the phone.

Paul Field said the pain of his daughter's death has never left him. Picture: Today Extra (Nine)

Bernadette had just started to crawl and babble and hadn't been ill leading up to her sudden death. (Supplied)

The next day he heard the news no father would ever want to hear – his baby girl who had never even been sick or appeared ill had passed away.

"Bernadette was just starting to crawl and talk," Field told 9news.com.au.

"In hindsight, I believe she was saying goodbye to me in that call. It’s heartbreaking."

Field, brother of the Blue Wiggle Anthony and an ambassador and promoter of Red Nose Day , shared his story with Today Extra hosts David Campbell and Sonia Kruger in the lead up to the national event.

The hosts and Field were reduced to tears as he recounted the day he lost his daughter.

Today Extra hosts David Campbell and Sonia Kruger struggle to contain their sadness at hearing the story. (Nine)

Field said his wife Pauline had been watching a segment on Red Nose Day when she went to check on her baby.

"Straight away she knew something was wrong,” he said.

"She ran screaming from the room and said 'she's not breathing'.”

The baby was rushed to hospital but there was nothing doctors could do to bring their little baby back.

"I was shaving at the time and my dad knocked on my door," Field said speaking about how he learned the tragic news from his father who was with his sons on tour.

"He just sat with me and said 'I need to tell you something. Bernadette is dead.'

"My brothers were in the next room and all they heard was this guttural wail."

Paul and Pauline Field with baby Bernadette. (Supplied)

Field doesn't remember much after that except arriving home and picking up the baby's lamb's wool mat and placing it against his face.

"I could still smell her," he said.

"It was like my last link to her had gone."

Field said his son Luke, then two, knew something was wrong and credits him with helping the grief-stricken couple through their grief.

"He saw us crying a lot and it affected him too," Field said, revealing how much he loved Bernadette - who would have turned 30 in September on the 30th anniversary of Red Nose Day.

"We had to explain in toddler terms what happened to his sister."

The couple went on to have three more children, Claire, Joseph and Dominic but their older sister was never forgotten.

"They’re very aware of Bernadette. It's nice to know she existed and her short life is remembered," he said, adding the family always talk about her.

"But I still can’t talk about her without tearing up."

Bernadette was just seven months old when she passed away in her sleep. (Supplied)

Clare, who is part of the Wiggles along with her famous uncle, are among the huge voices lending their support behind the Red Nose campaign.

Field said it was so important new parents discussed the risks and those who lost children or babies to Sudden Infant Death Syndrome talked to people about their grief.

"SIDS has been reduced by 85 per cent since the safe sleeping campaign was introduced," he said.

"That’s 10,000 babies who are alive today because of this."

Field's story touched a nerve with the Today Extra hosts. (Nine)

Field said talking about their grief with counsellors and others had helped his family, with many having lost, or known someone who lost a baby, themselves.

"It helped that I could look at these people and think, if you survived so can I," he said.

Field, who is managing director of The Wiggles, admits even his own brothers never really understood the depth of his grief until they went on to have children of their own.

"We were all in our 20s when we lost Bernadette and it was only when my brothers had children of their own that they began to really understand what we went through," he said.