The campaign of abuse against four-year-old Daniel Pelka was "very different" to a usual pattern of domestic violence, the author of a report into his death has said.
Ron Lock told Daybreak: "Most abuse that I come across is the result of parental stress and inadequacy. This was pre-meditated abuse, which is very rare".
Child protection services "have changed" and the number of referrals have increased, Mr Lock added.
Opportunities to protect Daniel Pelka, who was beaten to death by his mother and stepfather, 'were missed' a serious case has revealed.
Daniel Pelka's Serious Case Review is strong on what went wrong, but weak on explaining why it was allowed to happen.