Three separate reviews are investigating how and why abused Caboolture toddler Mason Jet Lee died a violent death last month.
As well as a police homicide investigation, the Queensland government on Sunday revealed the actions of doctors and child protection workers would also be probed following the 21-month-old's traumatic death.
The Courier Mail reports doctors notified the child safety department three months earlier when he was admitted to hospital suffering a broken leg, severe nappy rash, a ruptured bowel and an anal tear.
But despite evidence he had been abused over a long period, Mason was sent home.
Police last week revealed the toddler "suffered horrific injuries from head to toe" just before he died on June 11.
His 35-year-old stepfather was initially questioned by detectives before being released without charge a day later.
Detective Superintendent Cheryl Scanlon could not confirm details of the homicide investigation on Sunday, nor said whether the man remained a suspect.
While the government would neither confirm accusations a backlog of cases involving a transferred staffer was to blame, the actions of child safety officers will be reviewed by an independent expert panel.
Child Safety Minister Shannon Fentiman promised all the panel's recommendations would be implemented.
The incident has seen the opposition label Queensland the worst in the nation when it comes to investigating child abuse.
Liberal National Party's shadow minister Ros Bates said RTI documents showed up to 46 per cent of reports weren't followed up within the appropriate time frame of 30 days.
She claimed the figure was three times worse than Victoria and Queensland was on the verge of a child safety crisis.
"The fact that Mason was returned back to his family is horrendous," she said.
"This minister needs to explain to Queenslanders what her department did, what they knew and what they're going to do to make sure (this) never happens again."
But PeakCare Queensland executive director Lindsay Wegener said it was always difficult to know when children should return to their family.
"That's the dilemma of child protection," he said. "You're damned if you do and you're damned if you don't."
He also stressed Queensland has more rigorous reporting rules and counting methods than other states which skewed child protection figures.
Health Minister Cameron Dick has also asked for a director-general's report into the actions of doctors before Mason was fully discharged from hospital.
* National domestic violence helpline: 1800 737 732 or 1800RESPECT. In an emergency call triple-zero.
