Health & Safety

Car Seat Safety

Child Safety Seat Guidelines

Download child safety seat guidelines as a PDF (English, Spanish).

Children are safest in the car when they use the correct safety seat based on their height and weight and the seat is properly installed.

Stage 1: Rear-facing car seat for infants and toddlers

Rear-facing car seatA rear-facing car seat has a harness and will protect your child’s head, neck and spine. A five-point harness gives the best protection for your child. Starting in 2020, children under age 2 in Washington State must use rear-facing car seats. Keep your child in a rear-facing car seat for as long as possible, until they reach the highest weight or height allowed by their seat. If your child starts with a rear-facing-only seat, they should continue to ride rear-facing in a convertible or all-in-one seat until they reach the upper rear-facing size limits for their seat.

Stage 2: Forward-facing car seat for toddlers and preschoolers

Forward-facing car seatYour child will be ready for a forward-facing car seat with a harness when they reach their top height and weight limit allowed for their rear-facing car seat (check the manufacturer’s instructions). A five-point harness gives the best protection for your child. Use a forward-facing car seat until they are at least 40 pounds. Many seats can be used for children up to 65 pounds.

Stage 3: Booster seat for school-aged children

Booster seatOnce your child outgrows their forward-facing car seat it is the law that they use a booster seat with a lap and shoulder belt until they are 4 feet, 9 inches tall. A booster will raise your child so their lap and shoulder belts fit properly – this will keep them as safe as possible until they are ready for a seat belt. Your child may need to use a booster for many years depending on how quickly they grow. Some children are not ready for a seat belt until they are 12 years old.

Stage 4: Seat belts for older children

Seat BeltYour child can safely ride without a booster seat once all of these steps are met:

  1. Child’s back rests against the vehicle seat
  2. Child’s knees bend at the edge of the seat
  3. Lap belt rests on top of thighs (not the belly)
  4. Shoulder belt lies between the neck and shoulder
  5. Child does not slouch or play with the seat belt

If your child is younger than 13 they should continue to sit in the back seat. Wearing a seat belt is the law. Your child will be more likely to wear their seat belt during every ride if they see that you and others in the car wear one too.

What kinds of car seats are there?

Infant car seat

An infant car seat is used rear-facing and is designed for newborns and small babies.

Convertible seat

A convertible seat may be used with children of various sizes and can change from a rear-facing seat to a forward-facing seat with a harness and tether.

All-in-one seat

An all-in-one seat may be used with children of various sizes and can change from a rear-facing seat to a forward-facing seat with a harness and to a booster seat.

Combination seat

A combination seat can transition from a forward-facing seat with a harness and tether into a booster seat.

Booster seat

A booster seat is a car seat without a harness. Children use a booster seat when they are too big for a car seat but not big enough for an adult seat belt. A no-back booster seat can be used in cars with headrests in the back seat. A high-back booster can be used in cars with or without headrests.

See information about when to use booster seats and how to install them.

Car Seat Safety Tips

  • When shopping for a car seat for your child, choose a seat that fits your child’s size and can be installed correctly in your vehicle. A seat that costs more isn’t necessarily safer.
  • Check your child’s car seat label regularly to make sure your child meets the height and weight range of the child safety seat.
  • Secure your child in their car seat without coats or heavy jackets and then tighten the harness.
  • Adjust your child’s harness straps before every ride for the highest level of safety.
  • Model safe practices by wearing a seat belt at all times while riding in the car.

    Watch in Spanish

    Watch in Spanish

    Seattle Children's Car Seat Checks

    Seattle Children’s offers appointment-based car seat checks at two locations (Seattle and Bellevue).

    Join us for a free safety check with certified car seat technicians. Learn the proper way to install a car seat in your car and ensure that your child is properly restrained in the car seat, booster seat, or seat belt. New and expecting parents are welcome.

    Seattle car seat checks

    We are happy to bring back our Sand Point car seat checks for another year!

    Register Now

    Bellevue car seat checks

    Made possible with support from Overlake Medical Center & Clinics

    • Tuesdays, 10 a.m. to 1 p.m.

    Appointments are required.

    Register Now

    See more information about car seat checks.

    Find More Car Seat Checks in Your Area

    Virtual offerings

    King County Certified Child Passenger Safety Technicians offer free virtual car seat check appointments via video chat platforms. For more information, email Laura Miccile or call 206-477-8664.

    South County Fire and Safe Kids Snohomish County offer free virtual car seat classes. Classes take place on:

    Car seat check events

    Many organizations offer regular, free car seat checks. Come and learn how to safely secure your child in the car.

    Car Safety Resources