![Aria Dunn drowned in the swimming pool at her family's house in Raby.](/web/20161215155233im_/http://www.smh.com.au/content/dam/images/g/t/9/u/b/k/image.related.articleLeadNarrow.300x0.gt9t63.png/1481589756283.jpg)
A toddler who drowned after falling into a backyard swimming pool in Sydney's south-west at the weekend has been remembered as a "beautiful little angel", as friends rally around her heartbroken family in the lead up to Christmas.
Aria Dunn, aged 20 months, was pulled unconscious from the swimming pool at her family's house on Thunderbolt Drive in Raby just after 4pm on Sunday.
Family members and neighbours attempted to revive Aria, before NSW Ambulance paramedics took her to Campbelltown Hospital. She was pronounced dead a short time after arrival.
Aria's mother, Hollie Dunn, posted a photograph of her daughter on Facebook on Tuesday, prompting an immediate outpouring of messages of condolence and support for her, husband Craig and their son Jett.
"I love you all more than you know and can only tell you how truly sorry I am for the loss of your beautiful little Aria. May she forever fly free with the Angels," one family member wrote.
Another person said: "Hollie there are no words we can say to make the pain ease, just know that we are here for you all and we love you all. There will always be a special angel looking over you, Jett and Craig. RIP Aria we love you."
Another said: "Please just know that you and your family have not left my thoughts since hearing of the loss of your beautiful little girl. Always here if you need anything Hollie. Rest in peace Aria. Lots of love always."
The State Coroner will investigate how Aria managed to get through a safety fence surrounding the swimming pool on the afternoon that she died.
Acting Superintendent Michael Rochester said the "very tragic" accident should serve as a reminder for others to check the safety of their pool fences.
"It's a timely reminder that you can never be too vigilant with children and swimming pools," he said.
"There are a number of significant security measures that need to be in place as per the regulations for swimming pools and they include pool fencing and adequate self-closing gates."
Aria's death came a day after a young boy was taken to hospital in a critical condition after a near-drowning in Castle Hill, in Sydney's north-west.
Police and paramedics were called to the house on Castlewood Drive just before 4pm on Saturday after a 22-month-old boy fell into the backyard swimming pool.
He was pulled from the water unconscious, but was revived by family members and the medical crew of the CareFlight rescue helicopter, which flew to the scene.
The boy was taken to The Children's Hospital at Westmead, where his condition is understood to have improved.