. >> reggie mckinnon's 17-month-old daughter peyton died after he forgot she was in the back seat.e had taken her from a doctor's appointment and driven back to work. his office was a block from her day care. >> when i opened the back door to the vehicle, you know that's the moment that my, my life and my family's life changed forever. i found peyton still in her car seat. >> the interior of a car can heat up fast. adding 2 degrees a minute. in just a half-hour today this car reached nearly 1225 degrees. child heat stroke in cars can happen when the outdoor temperature is as low as 57. deborah herzman from the national safety council. >> when people get out of their normal routines. when they get preok tide by something that is going on in their life. they may have a different day than normal. they may forget the child is in the back seat. >> that warning is the first of its kind system. general motors is rolling out in the 2017, gmc acadia. it alerts the driver of any trip if the rear door was previously opened. a reminder that could save a life. we left the suv out in the sun for

. >> reporter: reggie mckinnon 17 month old daughter peyton died after he forgot to drop her off at daycareollowing a doctor's appointment. he drove back to work, just one block from peyton's daycare. >> when i opened the back door to the vehicle, um, you know, that's the moment that my -- my life and my family's live changed forever. i found peyton still in her car seat. >> reporter: so far this year, 23 kids in 14 states have died after being left in hot cars. experts say heat stroke can happen when the outside temperature is as low as 57 degrees. >> it's very preventible. >> reporter: debra former chair of the ntsb she runs the national safety council she's urging parents to look before they lock their cars. >> truly it's that we are distracted by the task at hand. we're not remembering the most precious cargo that's in the back seat. >> reporter: that's a warning sound general motors hopes can help prevent these type accidents. new technology built into the 2,017gmc acadia is the first of its kind to alert drivers if a rear door was opened prior to the start of their current drive. a si

. >> reporter: reggie mckinnon's 17-month-old daughter peyton died after he forgot she was in the back seat. he had taken her from a doctor's appointment and driven back to work. his office was just a block from her day care. >> when i opened the back door to the vehicle, you know, that's the moment that my life and my family's life changed forever. i found peyton still in her car seat. >> reporter: the interior of a car can heat up fast, adding two degrees a minute. in just half hour today, this car reached nearly 125 degrees. child heat stroke in cars can happen when the outdoor temperature is as low as 57. deborah hersman from the national safety council. >> when people get out of their normal routine. when they get occupied by something going on in their life, they may just have a different day than normal. they may forget that that child is in the back seat. [dinging] >> reporter: that warning is a first-of-its-kind system general motors is rolling out in the 2017gmc acadea. it alerts the driver at the end of any trip if the previous door was previously opened, a remind they're co

. >> reggie mckinnon's 17-month-old daughter died after he forgot to drop her off at day care followingoctor's appointment. he drove back to work, one block from peyton's day care. >> when i opened the-- the back door to the vehicle, the moment my life and family's life changed forever. i found peyton still in her car seat. >> such a tragic death. she is urging parents to look before they lock their cars. >> truly it is that we distracted by the task at hand. not remembering most precious cargo in the back seat. >> that's a warning sound, general motors helps can prevent the accidents. the new technology built into the 2017 gmc acadia, first to alert drivers if a rear door was open prior off to the start of the drive. a simple reminder that could save a life. there are smart phone apps that can remind parents. they have to remember to use them. this warning system. beeping you can will be expanded in the near future. captioning funded by cbs >>> it's wednesday, july 27th, 2016. welcome to "cbs this morning." >> hillary clinton makes history as at the democratic national convention, beco

. >> reporter: reggie mckinnon's 17-month-old daughter after he forgot to drop her at day care afterork just one block from his work. >> when i opened the back door, that's the moment that my life and my family changed forever. i found peyton still in her car seat. >> it's such a tragic death. it's very preventible. >> deborah herchman is ahead of the ntsb. she's urging people to look before they lock their cars. >> truly, we're not remembering the most precious cargo in the backseat. >> reporter: that's a warning sound general motors hopes can prevent these types of accidents. the new technology built into the 2017 gmc acadia is the first of its kind to alert drivers if a rear door was open prior to the start of their current drive. a simple reminder that could save a life. >> there are some smart phone apps that can remind parents but they have to remember to use them. this warning system, the beeping you can hear here will be extended to other gm models in the near future. gayle. >> all right, kris. don't you think whatever technology they can use -- >> i can't think of anything w