accidentshan 55% were just like balfours. it can happen to anyone. happened to a nasa scientist. >> stress or something that breaks a normal routine are common factors. had had little sleep that week because bryce was sick and dropped her husband off at work that morning which was unusual. >> in my mind i'm thinking, that i've already m a stop, i've dropped the baby off. >> she says one way to prevent them is to put a reminder every time your child is in the car or in theething you'll need back seat. >> a lot of parents have developed a plan where they take a shoe off and they physically put it back with the child. > and even if she's positive none of the four children she's had since bryce are in the car -- > every time i get out of the car i check the back seat. >> and for those who don't think did.could ever do what she >> script has a right to disagree, that it could happen to them but i ask them one do you ever want to know what it feels like to perform cpr on your own child? are you willing to play russian roulette with your child's life out it