Television host David Koch has admitted he "might be a bit of a dinosaur" but is defending his stance on breastfeeding after his comments prompted a Sydney rally of nursing mums and bubs.

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Kochie admits he may be bit of a dinosaur
Kochie admits he may be 'bit of a dinosaur'

Television host David Koch has admitted he "might be a bit of a dinosaur" but is defending his stance on breastfeeding after his comments prompted a Sydney rally of nursing mums and bubs.

About 100 people protested outside the Seven Network's Sunrise studios in Martin Place today after the television presenter said women should be "classy" when breastfeeding in public.

He was responding to a story about a Queensland woman who was told she couldn't feed her baby by the side of a public pool.

An organiser of Monday's "nurse-in", Amy Ahearn, was a guest on Sunrise.

"By saying that women should cover up or be discreet - that word has a shame connotation," she told Koch.

Koch apologised for causing offence and even stepped outside the studio to meet with mums, but said he was standing by his original comments.

"If you're breastfeeding uncovered, then I think you need to do it discreetly," he said.

On the street outside, fellow rally organiser Ash Zuko and her partner carried their baby Akiva in a sling bearing the words "anywhere, any time".

"You can't dictate when your baby wants to eat, that's the whole point," she said.

Koch later compared the reaction from the breastfeeding lobby to what he experienced when he made disparaging comments about pop star Justin Bieber.

"It's almost as bad as when I said something crook about Justin Bieber and got all these little Bieber fans saying 'I hope you drown in your own blood'," he told the Fairfax radio network.

"I suppose that I am a bit of a dinosaur in this regard but I think we have to think about our environments around us - common courtesy."