When Can a Child Switch to a Regular Seat Belt?

Some states allow children as young as five to use nothing more than a seat belt.1 However, laws and age can’t really determine whether a seat belt will be able to do its job and protect your child during a crash—that should be decided by your child’s ability to safely and securely wear an adult seat belt.

Determining When Your Child Is Ready for Seat Belts

Once your child reaches booster seat age, it’s best to keep them secured in a booster seat until their height ensures safe use of a seat belt only. To protect them in the event of an accident, the seat belt needs to fit them properly. You can use these five simple questions to find out if your child is truly past car seat age and ready to say goodbye to the booster seat.

  1. Can your child sit with their bottom and back all the way against the seat?
  2. Does the upper seat belt strap lay against the shoulder between the neck and the arm?
  3. Do your child’s feet rest on the floor, with their knees bent at the edge of the seat?
  4. Is the lap belt secured low and tight across your child’s thighs and hips?
  5. Will your child be able to stay in this position for the duration of the trip?

If the answer to any of those questions is “no,” then you need to wait to move on to seat belt travel. Usually, a child’s height will be the key to answering “yes” to these five questions. For most kids, the magic height is 57 inches. At that height, they will usually be able to wear an adult seat belt properly in most vehicles. For many children, it might take until they turn 10 or 12 to reach that height.

The important thing to remember is that a properly fitting seat belt is the guide to go by, not age. Even though laws in your state may have a low car seat age or booster seat age, you need to gauge seat belt readiness by your child’s physical stature; their safety depends on the ability to safely and comfortably wear a seat belt as intended by the designers of these safety devices.

Keeping Your Child Safe in the Car

When trying to determine if your child is physically ready to be safe with only a seat belt protecting them, remember the following:

Graco Nautilus 65
  • A lap belt should never rest across your child’s abdomen.
  • The shoulder belt should rest across the chest and collarbone, not the neck.
  • All children under the age of 13 should sit in the back seat.
  • Once children properly fit into a seat belt, they should always wear both the lap and shoulder belts properly at all times and in all seating positions during travel.

Until your child meets the above safety guidelines, it’s best to keep them in a booster seat appropriate for their size and age. Read through our guide to car seats to learn more about popular models.


  1. Governors Highway Safety Association, “Child Passenger Safety,” Accessed August 26, 2020.
SafeWise Team
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SafeWise Team
The SafeWise Team is here to help you keep your home and family safe. Whether you’re looking to pick a security system or identify and remove common risks in your home, we’re here to help you find the best products and well-researched answers. At SafeWise we combine our years of experience in home safety and security with user reviews and feedback to help take the guesswork out of living safe.