Function

• Booster seats elevate children so that the car's seat belt can work effectively in the event of an accident. Booster seats also help route the belt so that it is positioned correctly across the shoulder and lap of your child.
  
  

Types

• There are two types of booster seats--backless boosters and highback boosters. Highback boosters are designed to support your child's head and neck if your car doesn't have headrests. If your car has headrests, either type of seat is fine.
  
  

When to Use

• Children who are at least four years old and 40 pounds can use a booster seat. All children under 57 inches should use a car seat.
  
  

Considerations

• There are other considerations besides size when deciding to move a child into a booster seat. He should be able to sit properly for the entire length of the car ride, without slouching or moving the seat belt. If your child cannot do this, you should consider a different type of car seat, if possible.
  
  

Warning

• It is not okay to use lap belts with booster seats. If your car only has lap belts, you should look into other types of car seats or check to see if shoulder belts can be installed in your car.