New data released today by NSW Ambulance has shown that 151 children have been rescued from locked cars in the past year.
This works out to be three break-ins each week to rescue children accidentally locked in by distraught parents - with some of the children just a few days old.
As the temperatures heat up, the data has been released as a reminder to parents that cars heat up incredibly quickly, reaching temperatures of 78C inside on hot days.
Some of the children rescued have been trapped for as long as 40 minutes, and suffered shallow breathing by the time they were freed from the car.
And with this summer set to be incredibly hot, the warning serves as a timely reminder that it's never a good idea to leave kids or pets in the car.
"Even parking your car in the shade doesn't mean it's a safe place to leave a child," Steve Vaughn from NSW Ambulance told the Hit Newsroom.
"The temperature inside a car can very quickly soar to 50C and be up towards 80C in minutes.
"No matter how quick you think you're going to be - if you're just stepping inside the petrol station to pay for your petrol - you should never intentionally leave a child or a pet unattended in your car."