A young Sydney couple have been left shattered after their daughter drowned in their backyard pool yesterday afternoon.  Twenty-month-old Aria Dunn was found by her father Craig in the swimming pool of the family home in Thunderbolt Drive in Raby about 4.15pm, and was pronounced dead at Campbelltown Hospital a short time later.  Acting Superintendent Michael Rochester said the “very tragic” drowning was a reminder for families to check whether their pool had the relevant safety measures.  “It’s a timely reminder that you can never be too vigilant with children and swimming pools,” Supt Rochester 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.”  Holly and Craig Dunn with Jett (left) and Aria. (Supplied)  The Raby property at which the one-year-old tragically drowned. (Supplied)  Superintendent Michael Rochester said the incident was "very tragic". (Supplied)  The drowning is the second tragic incident in Sydney in as many days. On Saturday, a two-year-old boy was plucked from his family’s Castle Hill pool unresponsive. He was rushed to The Children’s Hospital at Westmead, where he remains today.  In 2015, doctors at The Children’s Hospital treated 32 cases of near drownings. This year, 25 children have been admitted.  “It’s terrible. They come to the hospital and everything in their world has just changed,” paediatric emergency physician Mary McCaskill said.  “Somebody takes their eye off the child, the child suddenly disappears - and it’s silent. So you don't get any warning that anything bad is happening.”  A free online course in delivering CPR to children and babies is available at kidshealth.schn.health.nsw.gov.au/cpr.  © Nine Digital Pty Ltd 2016
The drowning of a one-year-old girl in a backyard pool in Raby, suburban Sydney, has been labelled &ldquo;tragic&rdquo; by police.&nbsp;