How do you best keep your child safe while they ride in the car? The recommendations can be confusing. Babies should ride rear-facing in the back seat until they are at least 2 years old (or reach the highest weight & height allowed by the carseat); after that, they should ride front-facing in a carseat with a harness until they reach the upper limit of height & weight for that carseat. Kids can then sit in a belt-positioning booster seat (still in the back seat) until they are 4 foot 9 inches tall and are 8-12 years old. Children younger than 13 years should not ride in the front seat of the car.