There are some safety tips from kidsincar.org you can use to help take steps so this doesn't happen to you
Keep a stuffed animal in the child's car seat when they're not in the vehicle. When they are in the car keep the stuffed animal in the front seat as a reminder your child is in the vehicle
Use your debit or credit car at the gas pump so you don't leave your children's side.
And when a child is missing , Check vehicles and trunks immediately. Time is crucial especially in this kind of weather.