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.
More top news
It comes in contrast to other major European countries including Germany, France and Spain where growth exceeded expectations.
Nine people have died and several are in hospital after being discovered in the back of a lorry in a car park in Texas.
The parents of the terminally-ill 11-month-old say there is new evidence they hope will persuade a judge to change his mind.