Most children will need to stay in a 5-point harness booster seat until they reach the height or weight limit for that particular seat. The average height for a child to outgrow a 5-point harness booster seat is 4’9”, and the average weight is 80 pounds. However, it is important to check your specific seat’s height and weight limits to be sure. Some seats have higher or lower limits, so it’s best to consult your car seat manual or the manufacturer’s website. Once your child has reached the height or weight limit for their 5-point harness booster seat, they can move on to a belt-positioning booster seat. Belt-positioning boosters are designed for children who have outgrown their 5-point harness seats, but are not yet big enough to use a regular adult seatbelt safely. Most children will need to stay in a belt-positioning booster until they reach 4 feet 9 inches tall and weigh between 80 and 100 pounds. Again, it is important to check your specific seat’s height and weight limits before making the switch. After your child has outgrown their belt-positioning booster seat, they can graduate to using a regular adult seatbelt in the backseat of the car. It is important that they continue riding in the backseat until at least age 13, as this is the safest place for them in case of an accident.