Children under the age of 4 and weighing less than 40 pounds must be in approved child safety seats. All children under the age of 2 must use a rear-facing car seat until they are two years old or reach the highest weight or height limit allowed by the manufacturer of the car seat. For babies that outgrow their infant-only car seat, a convertible or 3-in-1 car seat should be used in the rear-facing position until they outgrow the maximum height and weight for the rear-facing position. Children ages 4, 5, 6, and 7 must be properly secured in an appropriate child restraint system, such as a child safety seat, harness/vest, or booster seat. Seat belts are not designed for children under 4’9”, and do not protect small children. Your child should stay in a booster seat until the adult seat belt fits him or her properly. This is usually when your child reaches 4’9" in height and is about 8 years old. All drivers and passengers are required to use seat belts.