Professor Stephen Pilling told Daybreak that children with conduct disorder require a "different way of parenting".
He added that families are not to blame when children are challenging, but parents do need help to get the best out of their child.
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Sean Cox is being treated for his injuries at Walton Neurological Centre, where his condition is described as critical.
The bank’s chief executive Paul Pester said he was ‘truly sorry’ for the ongoing problems.
'By the middle of the century, quarter of the population, will be obese,' Hugh Fearnley-Whittingstall, celebrity chef and campaigner said.