Queensland detectives are appealing for witnesses following the suspicious death of a toddler north of Brisbane last month.
Paramedics were called to a Burpengary address on the afternoon of December 30 in relation to the medical welfare of a child.
The 16-month-old boy was transported to hospital in a critical condition and died just over a week later, with the cause of death still unknown.
He was at home with his mother and his mother's partner before emergency services arrived, Detective Senior Sergeant Joe Zitny said on Wednesday.
"Due to the tragic circumstances of what we believe happened at that location, the child has passed," he said.
Police have obtained versions of what happened from people at the house at the time, and are now appealing for more witnesses.
Anybody who saw suspicious behaviour involving a male child near Staaten Street, Burpengary in the lead up to Thursday December 30, is encouraged to make contact.
