As we head into the summer months, doctors are reminding parents and babysitters about the dangers of a hot car.

Last year, 52 children nationwide died after being left in a hot car. That's the most on record in the last 20 years.

So far in 2019, 11 children have been killed the same way, a way doctors say is 100 percent preventable.

"Think of your car as an oven," said Dr. Andrew Miller, medical director of the children's emergency department at the Lehigh Valley Reilly Children's Hospital.

As temperatures outside rise, those inside your car are climbing even higher.

"90 degrees outside, in 10 minutes your temperature inside will go up to 109 degrees. In 20 minutes, up to 120 degrees and in 30 minutes, 130 degrees," said Dr. Miller.

That kind of heat is dangerous, and even life-threatening, for any person left inside, especially a child.

"They can't process it as easy. They'll internalize it more and it will cause some devastating effects very rapidly," added Dr. Miller.

Experts say in many cases, these tragedies happen to good parents who simply become distracted.

"You just forget because your routine is to go from home to work and so we've had cases across the country where this happens and the kids are just forgotten," said Dr. Miller.

Newer-model cars now have built-in technology which help prevent these incidents from happening.

"The next time the vehicle is turned off a little message comes up on the driver information center, it beeps at you and says 'Rear Seat Reminder, check your back seat' and it's a good reminder to look in your back seat and make sure you didn't forget anything or anybody," said Luke Santana, a sales and leasing consultant at Rentschler Chevrolet in Slatington.

If you're walking through a parking lot and see a child trapped inside a vehicle, doctors say it's important to act.

"Call 911 and get that child out. Whatever it takes to get them out, get them out," added Dr. Miller.

Doctors stress this is something that can happen to anyone. 

If you are driving with kids in the car, experts have some tips to help you remember to check your back seat. 

Every time you park, make it a routine to open your back door. They also suggest putting something you need, like your cell phone or purse, in the back seat so it forces you to open the door. Set a distinct alarm on your phone to remind yourself to drop your child off at school or daycare. And again, if you're buying a car, consider technology that alerts you to check the back seat.