PROVO — Safe Kids Utah and the Utah County Health Department are urging parents not to buy car seats secondhand from garage sales and thrift stores.

Car seats expire six years after they are manufactured because of changes to federal safety regulations. Instruction booklets for the seats usually don't accompany them at thrift stores or garage sales and therefore, they may be installed incorrectly. Car seats that have been involved in an accident may look fine, but have structural damage.

For more information about car seat installation and child passenger safety, visit www.utahcountyhealth.org.