Hinch exploded on his blog, Human Headline, titling the rant Not a Yumi Mummy, after Stynes took six-month-old daughter Mercy to the red carpet premiere of Paddington wearing nothing but a nappy.

YUMI HITS BACK AT NAPPY CRITICS

DAVID CAMPBELL: YUMI STYNES TAKES SIX-MONTH-OLD TO RED CARPET IN A NAPPY

Yumi Stynes with six-month-ol daughter Mercy at the Australian premiere of Paddington in Sydney. Source: News Corp Australia

David Campbell was the first to declare “it’s weird”, but Hinch took it to another level.

Questioning whether Stynes was “suffering from attention deficit syndrome”, Hinch said his main objection was hygiene.

“She was wearing only a nappy. The daughter - not Stynes. Although nothing would surprise me,” Hinch sprayed.

Derryn Hinch. Picture: Julie Kiriacoudis Source: News Corp Australia

“Maybe Yumi doesn’t mind if bubba poos on her cowboy boots, but other people might object to the side spray.

“And, if I seem intolerant of such public behaviour, maybe it’s because I’m sick of selfish, blinkered mothers, using public areas as toilet stops for kids.”

Stynes was quick to react on Twitter, saying it was hurtful and inaccurate.

“Apparently dear old Derryn Hinch is trash-talking me. I’d ask a listener what he said but I don’t know anyone that old!” Stynes wrote.

“In other news, my delightful and fat baby learnt to crawl today! Yay. Xx”

Stynes, a radio and television presenter, and mother of three children, made headlines two years ago after making disparaging comments about SAS Corporal Ben Roberts-Smith on a television talk show.

She later said: “I’m really sorry. I didn’t mean to offend anybody.”