A 31-year-old woman and a 30-year-old man have been charged with the neglect of a six-month-old baby boy.
The baby was admitted to Collie Hospital on September 26 and due to his condition was transferred to Perth Children's Hospital.
The baby died in hospital on October 5.
It is not yet clear how the baby died.
The man and woman from Collie have each been charged with one count of failing to protect a child from harm.
They will both appear in the Perth Magistrates Court today.
Cooloongup man accused of historical child sex offences dies just weeks before trial
Boat owners urged to make safety a priority this Easter
Mundijong man accused of attempting to procure children overseas for sexual activity
PM Anthony Albanese to address nation
Mandurah teacher who raped student to remain on bail
Man charged after allegedly exposing himself to girl on Transperth bus in Lakelands
Fire rips through Golden Bay home
Firefighters battle bushfire near Nambeelup
Alcoa Children's Festival cancelled due to severe weather