Child safety seats


Child car seats; Infant car seats; Car seats


Automobile accidents are one of the major causes of injury and death in children. In the United States, the law requires car seats for children under 40 pounds. For children over 40 pounds, laws vary by state.

When your child is born, you must have a car seat to bring the baby home from the hospital.


It is best to use a new car seat. Used car seats often do not have instructions and may have cracks or other problems that make the seat unsafe. For example, the seat may have been damaged during a car accident.

All car seats have expiration dates somewhere on them, usually on the bottom of the seat. Do not use a car seat past its expiration date, as the plastic may no longer be strong enough to support your child safely.

The "best" seat depends on your:

  • Child's age
  • Child's weight and height
  • Car

The seat must fit your child's size and be able to be properly installed in your car. A more expensive seat is not always the safest or easiest to use. All car seats sold in the United States must meet government safety standards.

Make sure you fill out and return the registration card that comes with a new car seat. This way, the manufacturer will contact you if the seat is recalled because of a safety problem or other defect. If you do not have a card, call the company that made the car seat and ask for one.

There are several different types of child safety seats:

  • Rear-facing seats
  • Forward-facing seats
  • Booster seats
  • Car beds
  • Built-in car seats


A rear-facing seat is one in which the infant faces the back of the car. Always install a rear-facing seat in the back seat of your car. This is the safest position for an infant. NEVER place a rear-facing seat in the front seat of a vehicle with passenger airbags.

There are two types of rear-facing seats:

  • Infant-only rear-facing seats
  • Convertible seats

Infant-only rear-facing seats are for babies who weigh up to about 22 to 30 pounds, depending on the car seat. You will need a new seat when your child gets bigger. Infant-only seats have handles that allow you to move the seat from the car to the house or other locations. Some have a base that you can leave installed in the car, so you can just click the car seat into place each time you use it.

Convertible seats are for bigger infants and toddlers under age 1 -- up to about 30-35 pounds, depending on the seat. The seat can be used as a rear-facing seats for younger children, and switched to a forward-facing seat when the child is older and bigger. Experts recommend keeping the child in a rear-facing position until at least age 2 or older if he or she does not outgrow the weight or height allowed by the safety seat.


A forward-facing only seat is one in which the child sits facing the front of the car. The seat should be installed in the back seat of your vehicle. Most forward-facing only seats are for children who weigh between 20 and 40 pounds.

A combination forward-facing booster seat may be used for children who weigh between 40 and 65 pounds, depending on the seat. You can remove the seat's safety straps (harness) and use the booster alone, so that the car's lap and seat belts correctly fit the child.


A booster seat raises your child up so that the car's lap and shoulder belts fit correctly. The lap belt should fall across the child's upper thighs. The shoulder belt should go across the middle of the shoulder and chest.

A booster seat is used for older children who weigh up to about 80 pounds. Some states have passed laws requiring booster seats for children up to age 8 or 80 pounds. Check your state's law.


These seats, also called flat car seats, are for premature or other special-needs babies. The American Academy of Pediatrics recommends having a health care provider look at how your preterm baby fits and breathes in a car seat before leaving the hospital.


Some cars and vans have built-in car seats. Weight and height limits vary. You can get more details on these seats by reading the vehicle's owner's guide or calling the car manufacturer.


It is important to use child car seats properly. Studies show that most people do NOT properly install car seats. The seat must fit snugly and be positioned at the proper angle. Many people install a car seat far too loosely, even though they think the seat is tight. The seat should be snug and not move more than 1 inch forward or sideways.

Follow the manufacturer's instructions for installing and using your car seat. Also, read your car's owner's manual to determine the safest place in your car to install a car seat. If the instructions are unclear, call the company that made the car seat.

Contact your local police or fire station for help installing your seat. Many have free programs that will show you how to install the seat. To find a certified child passenger safety technician in your area, visit:

Child safety seats come with safety straps, called harnesses, which secure the child into position. Your safety seat may have a 3-point or 5-point harness system.

  • A 3-point harness system has two straps at the shoulder and one between the legs.
  • A 5-point system has two straps at the shoulder, two at the hips, and one between the legs.

The seat is secured into your vehicle using either the car's seat belts or the LATCH system.

LATCH stands for lower anchors and tethers for children -- it is designed to make car seat installation easier. A child safety seat that comes with LATCH attaches to anchors in the back seat where the cushions meet. A strap called a tether connects the top of the safety seat to the car's frame. The car's seat belts are not used. All child safety seats and vehicles made after September 1, 2002 come with LATCH.

For more information on how to install child safety seats, see the National Highway Traffic Safety Administration web site: The NHTSA web site also provides a list of all child safety seats recalled since 1990.


Quintana EC. Belt-positioning booster seats and reduction in risk of injury among children in vehicle crashes. Ann Emerg Med. 2004; 43(4): 544.

Committee on Injury, Violence, and Poison Prevention. Child passenger safety. Pediatrics. 2011; 127(4):e1050-e1066.

Biagioli F. Proper use of child safety seats. Am Fam Physician. 2002;65:2085-90.

US National Highway Traffic Safety Administration. Misuse of child restraints. Washington, DC. US Department of Transportation, National Highway Traffic Safety Administration; 2004. DOT HS 809 671.

Review Date: 
Reviewed By: 
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.