the cybex sells for around $300. >> we're fallible. >> reporter: when i put the call out for advice on social media, parents offered up their own homemade hacks. many said leaving something critical in the back seat is the first, like a purse or wallet. megan suggested leave your phone in the back seat next to baby. another mother posted, take off your left shoe when you get in the car if the baby is with you, when you reach your destination, you're not going to walk out with a barefoot. put a big stuffed animal in the car seat. whenever you put your child in the car seat move the stuffed animal to the front seat of your car. >> this is a vulnerability that affects people from every walk of life and that no one is fully protected against it unless they t aays lan in place to always have to pay.they lock.>>p ne, t katy perry a rapper's riff. ♪ ♪ like a dark horse your car's soft surfaces because odon get released, and are then circulated by your ac system. to stop the cycle of odors try febreze car vent clips. febreze stops the circulation of musty air by trapping and eliminating linger

right now only two companies have models on the market, even flow and cybex.arents offered homemade hacks. many said leaving something critical in the back seat is the best, like a purse or wallet. megan suggested, leave your phone in the back seat next to baby. another mother posted, take off your left shoe when you get in the car if your baby is with you. when you reach your destination, you're not going to walk out with one barefoot. lauren says put a big stuffed animal in the car seat. whenever you put your child in the car seat, move the stuffed animal to the front seat every time. for "nightline" i'm diane macedo in new york. >> a big thanks to our friend diane, who was here yesterday, and amazing to get to see her son, adorable baby in that piece. it is a problem. this keeps happening. and i know a lot of us are left scratching our heads wondering how? but it does. >> those tech changes could really help and save some lives. >> yeah, absolutely. >>> coming up next half hour, the traffic stop that one state trooper will never forget. that's because it in