Why you shouldn't lie to your kids about Santa

The myth surrounding Santa Claus is doing children more harm than good according to one expert.

Australian social scientist Dr Kathy McKay claims children can be traumatised upon discovering the magical Christmas figure is not real, and have to "reconceptualise everything", The Daily Telegraph reports.

"Morally, making children believe in myths such as this has to be questioned," the NSW woman wrote in the Lancet psychiatry journal.

Dr McKay further criticised the idea of a judgmental, gift-giving man assessing the behaviour of children around the world.

The article, co-authored by psychology professor Christopher Boyle, also suggested parents are motivated to maintain the myth of the festive figure out of a selfish desire to relive their childhood.

Dr McKay says the children she works with on Nauru are perfectly happy not having the Santa tradition.

"I think it's easy to get that tradition to change, the Santa tradition is a relatively new one," she told the Daily Telegraph.

"It's not about necessarily getting rid of Santa but understanding why you're choosing to have Santa and why that's important to you and having those really important conversations about lying."

But Michel Carr-Gregg, a child psychologist, said Santa Claus was an important part of Australian culture and makes Christmas magic.

"For many families the excitement of leaving stuff out for Santa, watching through the window at night, they're just lovely traditions," he told the Daily Telegraph.