Two children digging in the sand on a Sydney beach discovered the body of a naked baby on Sunday morning.
The brothers, aged six and seven, were attending a Nippers life saving event when they found the body buried in 30cm of sand around 20m to 30m away from the water's edge on Maroubra beach.
News.com.au reports that they alerted their father who called the police and the area was evacuated.
Sydney police said children and parents involved in the morning's events were receiving counselling from Maroubra Surf Life Saving.
A police spokesman said it is a "tragic event" and everyone involved is "very upset".
According to The Guardian, an NSW police statement read: "Police from Eastern Beaches Local Area Command were called to the beach and have established a crime scene which will be examined by specialist forensic officers.
"Officers from the police rescue squad are also on scene and investigations into the child's death are continuing, however, the age and sex of the child are yet to be determined."
Speaking to Daily Mail Australia, one of surf lifesaver said: "It's just awful. It will have traumatised the poor the kids for life, no matter how much counselling they get."
Police are searching through CCTV footage in the area to determine when the baby was buried.