Hot weather is here. Every year there are new reports of children dying after being left in hot cars. Hopefully, this annual reminder will prevent another death.

The inside of a car can heat up very quickly — even when the temperature outdoors is mild. On an especially hot day, the interior of a car can heat up to 122 degrees in less than 20 minutes, and within 40 minutes, it can get so hot that a child left inside a car for that length of time can die. Many parents think that leaving the window of the car open slightly will keep the temperature lower, but fail to realize that it will still remain too hot in the car for the child.

Young children, especially infants, are more sensitive to heat than an adult because their bodies do not regulate temperature as well as an adult’s body does. A child left in a hot car can suffer from heat stress, dehydration and shock.

Heat stress occurs when sweat cannot evaporate quickly enough to keep the body cool. Symptoms of heat stress include muscle cramps, headache, dizziness, nausea and vomiting. Heat stress can lead to dehydration because of fluid loss due to excess sweating. To “go into shock” means that the body’s blood pressure gets too low to pump oxygenated blood to all of the tissues in the body and cells in major organs, such as the brain, heart, liver and kidneys can die and the organs can be permanently damaged.

Please remember:

• Never leave a child alone in a car — even with the windows down. Take your child inside with you rather than leaving them in a running vehicle. Parents can be charged with negligence and child endangerment in Texas for leaving a child alone in a car, even if it is running.

• Teach your children not to play in or around cars.

• Lock car doors when you exit them, and keep your keys out of your child’s reach.

• Double-check to make sure that everyone has exited the car when you arrive at your destination. It’s worth looking twice to make sure that you have removed your child from the car, especially if you have other items to carry inside. Though this may seem silly, please remember that children have died because they had fallen asleep in their car seats, and their parents did not realize that they were still in the car.

• Carry plenty of water when traveling with children.

• If your car has been parked outside on a hot day, consider placing a towel on the car seats so that it does not burn your child and consider purchasing window shades for both the front and rear windows of the car. Also, make sure that restraints, such as buckles on a car seat, are not too hot.

If you see a child (or animal) alone in a car, find the child’s parents or call 911.

Sally Robinson is a clinical professor of pediatrics at UTMB Children’s Hospital. This column isn’t intended to replace the advice of your child’s physician.