When do you start to use booster seat with your child?

Your child is ready for a booster seat when they have outgrown the weight or height limit of their forward-facing harnesses, which is typically between 40 and 65 pounds. Read your forward-facing car seat’s owner’s manual to determine height and weight limits, and keep your child in a harnessed seat for as long as possible. Children at this stage are not yet ready for adult safety belts and should use belt-positioning booster seats until they are at least 4’9″ and between 8 and 12 years old. Safety belts are designed for 165-pound male adults, so it’s no wonder that research shows poorly fitting adult belts can injure children.