A Sydney mum is expected to be charged with murder over the death of a baby boy she allegedly tried to drown two days before the fatal incident.
Emergency services were called to a home in Berowra Heights on March 21 following reports a 10-month-old baby boy was found unresponsive.
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He was treated at the scene by paramedics before being taken to The Children’s Hospital at Westmead in a critical condition.
Police established a crime scene at the time and launched an investigation.
Detectives from the Child Abuse Squad took over the investigation under Strike Force Dammeral.
They spoke to the 30-year-old mother at the hospital on March 22.
She was arrested and taken to Hornsby Police Station, where she was charged with two counts of attempted murder.
Police will allege she “restricted the boy’s breathing” at the Berowra Heights home on March 21.
Two days before that incident, the 30-year-old allegedly attempted to drown the boy at a home in Westleigh, police said.
The boy died in hospital on the afternoon of March 23, the same day his mother faced Hornsby Local Court and was refused bail.
7NEWS understands the boy was taken to hospital after the alleged attempted drowning incident but left with his mother the following morning without being discharged.
The hospital would not comment on how the mother managed to take her baby out of hospital or if any protocols were in place.
Premier Chris Minns said the health department was investigating why the woman was allowed to leave the facility.
“Obviously this is a serious issue, it’s before the courts and charges have been laid, so I’m not going to comment specifically about that case,” he said on Monday.
“The minister will take a report from the department in the coming days.”
Following the boy’s death, the 30-year-old’s charges will be upgraded to one count of murder and one count of attempted murder at her next court appearance.
She is due to face Downing Centre Local Court on May 18.