Westfield national public relations manager Deb McGhie was surprised at the mall ban, saying noisy children were "just life".
The company, which has 10 shopping centres across New Zealand, does not have a policy on unruly children.
"Anybody of any age, if they're behaving inappropriately then we take steps to deal with that but children crying or excitable, no we wouldn't have a sign like that," she said referring to the Dee Why Grand.
Banning children was the "complete opposite" of Ponsonby Central's family friendly policy, said manager of the new Auckland centre Leah LaHood.
"We're community based. We encourage them [children] - we're also dog friendly. They're losing their sense of community," she said.
The move by the Australian centre would not be followed by Sylvia Park mall, said centre manager Jonathan Douglas, who was not aware of any complaints from customers about noisy children.
However, Ms Mulcahy told News.com.au children at Dee Why Grand were sometimes so loud she could hear their screams in her office, which was "miles away" and they had received several complaints from customers.
Some staff avoided the food court because they found the noise "unbearable", she said.
