Booster seats are for older children who have outgrown their forward-facing seats. All children whose weight or height exceeds the forward-facing limit for their car safety seat should use a belt positioning booster seat until the vehicle seat belt fits properly, typically when they have reached 4 feet 9 inches in height and are 8 through 12 years of age. Most children will not fit in most vehicle seat belts without a booster until 10 to 11 years of age. All children younger than 13 years should ride in the back seat. Instructions that come with your car safety seat will tell you the height and weight limits for the seat.
As a general guideline, a child has outgrown a forward-facing seat when any of the following situations is true:
- He reaches the top weight or height allowed for his seat with a harness. (These limits are listed on the seat and in the instruction manual.)
- His shoulders are above the top harness slots.
- The tops of his ears have reached the top of the seat.
Types of Booster Seats:
High-back and backless are 2 standard types of booster seats. They do not come with harness straps but are used with lap and shoulder seat belts in your vehicle, the same way an adult rides. They are designed to raise a child up so that lap and shoulder seat belts fit properly over the strongest parts of the child's body.
Most booster seats are not secured to the vehicle seat with the seat belt or lower anchor and tether but simply rest on the vehicle seat and are held in place once the seat belt is fastened over a child. However, some models of booster seats can be secured to the vehicle seat and kept in place using the lower anchors or top tether. (Currently, only a few vehicle manufacturers offer built-in booster seats.)
Installation Tips for Booster Seats:
When using a booster seat, always read the vehicle owner's manual and the car seat manual before installing the seat. Booster seats often have a plastic clip or guide to correctly position vehicle lap and shoulder belts. See the booster seat instruction manual for directions on how to use the clip or guide.
Booster seats must be used with a lap and shoulder belt. When using a booster seat, make sure:
- The lap belt lies low and snug across your child's upper thighs.
- The shoulder belt crosses the middle of your child's chest and shoulder and is off the neck.
- If your booster seat has lower anchors or top-tether attachments, check its manual for installation instructions.
How to Use a Booster Seat - Video:
In this video, Benjamin Hoffman, MD, FAAP, a pediatrician and certified car seat technician, guides parents on how to properly use and install booster seats in your vehicle. Booster seats should be used until your child can correctly fit in the adult lap and shoulder seat belts, typically when they are around 4 feet 9 inches in height and 8 to 12 years old.