The use of children's booster seats is related to age, height and weight. Children have to sit in booster seats if seat belts do not fit them properly.
Adults have to make sure that children are safely buckled up in booster seats based on their age, height and weight. Children over the age of five who have grown out of their forward-facing car seats need to use booster seats until seat belts fit them properly. Seat belts fit properly when the belt rests across the chest and not the neck, and the lap belt rests across the upper thighs and not the stomach.
Usually children who are four feet and nine inches in height use a belt-positioning booster seat. Drivers can refer to the owner’s manual to find out the height and weight limits for booster seats. In general, a child is ready for a booster seat when his shoulders are above the top harness slots or his ears reach above the seat. Children who use booster seats still have to sit in the back seat because it is a safer place.
Drivers must install and use booster seats according to the manufacturer’s guidelines. They can use high-back boosters in vehicles with low seat backs or they can use backless boosters in cars with head rests and high seat backs. A driver can also seek the assistance of a certified Child Passenger Safety Technician with the installation of a booster seat.