A TWO-year-old girl who died overnight was submerged in a boiling hot bath earlier this week.
Police have confirmed the child, Maddilyn-Rose Ava Stokes, suffered major burns to the back of her legs down to her feet and to her buttocks.
Police would not confirm what day the burns were caused.
Maddilyn-Rose's mother, 23, and father, 30, were home at the time.
It has since emerged her parents have previously been charged with starving the little girl.
"Police are keeping a completely open mind," Detective Inspector Tim Trezise said on Friday.
"Nobody is more traumatised than the parents."
The parents have been co-operative with police.
Detective Inspector Trezise confirmed they were people of interest.
The cause of death is still to be determined, but a cardiac arrest caused by the burns is considered the most likely factor.
Police would not comment about whether the family was known to police.
Maddilyn-Rose's five-year-old sister was being "looked after".
Child Safety Minister Shannon Fentiman said her department had not been investigating or involved with the family "at the time of this tragic incident".
"My heart breaks for the family and friends of this little girl. There are many people grieving today," she said in a statement.
"We all need to be respectful of the police investigation under way.
"As already reported police are working with the family, who are fully co-operating with the investigation."
She said the department investigated all notifications of children at risk.
It is understood the Child Safety Department will undertake a child death case review, despite no complaints being made to the department about the toddler within the past 12 months.
Such reviews are usually not undertaken unless a child was known to the department in the year before his or her death.
Police have confirmed the toddler who died after a cardiac arrest north of Brisbane overnight had also suffered serious injuries including "significant burns".
The two-year-old was taken to Lady Cilento Hospital after suffering the heart attack.
A spokesman said police are working to establish the circumstances surrounding her death and the injuries she sustained.
Police will address the media this afternoon and have announced the investigation is being headed by the Boondall Child Protection and Investigation Unit.
Police are still trying to figure out what caused the girl's injuries.
A TODDLER has died in hospital overnight after suffering a heart attack yesterday.
Police and emergency services were called to a Northgate home about 4.30pm yesterday after the young girl stopped breathing.
The child is reported to have suffered significant injuries to her legs that may have been caused by scalding bath water.
Police, who remained at the home on Thursday night, said a man and a woman are assisting with inquiries.
A neighbour said the home was usually very quiet.
"I was quite amazed, because there was no noise and all of a sudden these ambulances were everywhere," she told the Nine Network.
"There is never any sound comes from there, nothing that gave any indication something was wrong".
A TWO-YEAR-OLD is in a critical condition after suffering a cardiac arrest in Brisbane's north on Thursday afternoon.
Police and emergency services attended the Northgate home around 4.30pm after the young girl stopped breathing.
Paramedics gave the girl life-saving CPR, according to 7 News, before rushing her to Lady Cilento Children's Hospital.
Queensland police confirmed they were investigating the incident and remained at the home Thursday night.
It is understood a man and a woman are assisting police with their enquiries.
The girl remains in a critical condition.