If the doorknob feels cool, he can slowly and cautiously open the door. Stop, drop, and roll. Explain what to do if a piece of your child's clothing should catch on fire. He should never run, which only serves to fan the flames. Instead, he should drop to the floor and roll around, which will smother the flame.
Small children can practice rolling on the ground to put out imaginary flames.
Don't go back. Most importantly, stress that no one should ever reenter a burning house to get anything, including toys or pets. Walk through your house or apartment with your children and show them the ways out of every room - including windows, doors, balconies, porches, and even big trees. Stress to your children that if there is a fire in the house, they should never hide under their beds or in closets - they must follow the escape plan or wait to be rescued if there is no way for them to exit safely. Emphasize that only Fire Exits are to be used, and the elevator should never be used during a fire.