Whether it's accidental, a parent forgetting a child is in the car or on purpose because they're just running inside somewhere, it's dangerous and deadly.
It only takes a few minutes for a car to become a death trap for a defenseless child.
Victoria Averbukh is overprotective with her baby and rightfully so.
She always runs the air conditioning before putting her in the car, she put a secondary protective film and screen over her tinted windows and she always carries plenty of liquids.
"We have a water bottle for us and a water bottle for her," said Averbukh.
Anecia Newton is the same with her two boys, 6-year-old Deandre and 4-year-old Matthew, on hot and hazy days like today.
Because she knows it takes just a few minutes for a child in a sweltering car to become unconscious, unresponsive and brain damaged.
"It's scary. Just for a few minutes it gets really hot in there and they could die just like that. So no mommy hasn't made that mistake and I'm not planning to make that mistake at all," said Newton.
A new study at San Francisco State University shows, 443 children died of hyperthermia between 1998 and 2009.
And so far this year, there have been 20 hyperthermia death from children left in cars.
The top two reasons:
Doctor Maja Castillo from TriBeCa Pediatrics says "When the temperature is 86 degrees or above like today, the temperature within the car can hit 150 degrees or greater within 15 to 30 minutes of turning the car off even if the windows are cracked." Dr. Castillo adds the child gains heat rapidly and there's no way to get the heat out. "Children do not sweat as much as adults and sweating is one of the main ways of cooling our body heat," she adds. Parents should create routines that remind them their child is in the car. For example, leave a handbag, a cell phone on the floor in front of the baby's car seat. And always keep the vehicle locked even in the garage or driveway.