Children should remain in certain car seats, depending on their height and weight, until they outgrow the weight or height limits. It’s important to look at the height and weight recommendations on the car seat and not base the seat on the child's age because children grow at different rates. Infants and toddlers should begin in a rear facing car seat, then move to a forward facing car seat, then a booster seat, before finally using only a seat belt. Seat belts usually begin to fit children properly once the child is 4’9” and between the ages of 9-12 years old.