Brisbane baby death treated as suspicious, mother questioned by police

The death of a five-month-old girl at her family's unit in Brisbane's south last month is being treated by police as suspicious after a post-mortem revealed it was "not a natural death".

The baby's 32-year-old mother was questioned by detectives on Sunday, but no charges have been laid. However, police say she is their only person of interest at this point in time.

Emergency services were called to a King Street unit complex in Annerley about 8am on November 16 after a triple-zero call from the mother saying her daughter was unconscious and not breathing.

The child was declared dead soon after paramedics arrived at the scene.

Detective Acting Inspector Rod Watts said the baby was seen alive and healthy in CCTV footage with her parents at Buranda Village shopping centre the day before she died.

"The medical evidence is one part of the investigation but certainly the investigations that we’ve done through our police methodologies have led us to believe this is not a natural death," he said.

"Someone knows something, between 5pm on November 15 and 8am on November 16 something has happened to that child which is suspicious … the child was happy and healthy one afternoon and the next morning the child was at home deceased."

Security camera footage showing the mother with their baby girl at Buranda Village shopping centre on November 15.Credit: Queensland Police Service

Acting Inspector Watts said the parents were a young couple and the girl was their first and only baby. The family was not known to police or child safety officers prior to the girl's death.

Both parents were at home in their Annerley unit on the morning of November 16 when the girl was found unconscious and a post-mortem showed no visible signs of injury.

Morningside child protection detectives and specialist child trauma investigators have appealed for public information to piece together the events leading up to the girl’s death.

They are asking for anyone who saw the baby with her parents at Buranda Village on November 15 or anyone who saw or heard anything at the King Street unit on November 15-16 to come forward.

Anyone with information should contact Crime Stoppers on 1800 333 000 or Policelink on 13 14 44 and quote the following reference number - QP2002375171.