If you are traveling with children under the age of 8 in the United States, you will need to educate yourself on the car seat regulations for your ultimate destination. For instance, if you are traveling to Dayton, Ohio, it would be helpful to know that in October 2009, the Ohio law changed to require children ages 7 and under, or less than 4 feet 9 inches tall, to be in a car or booster seat when riding in an automobile.