Fit & Comfort

Tightening the Harness

Mom adjusting seat chest clip


All Britax infant, convertible and harness-2-booster car seats have harnesses used to help keep a child safe and secure while sitting in a car seat.


A study released by the National Highway Traffic Safety Administration (NHTSA) revealed that nearly 60% of child harnesses were too loose. Loose harness straps leave your child vulnerable to injury during a crash because they may allow your child to move out of position. They can even lead to ejection from the car seat during a crash.


How snug should a harness be?
NHTSA states that, “a snug strap should not allow any slack. It lies in a relatively straight line without sagging. It does not press on the child’s flesh or push the child’s body into an un-natural position.”

How can I tell if the harness is snug enough?
To tell if your child’s harness is snug enough, perform the simple Pinch Test:

  • Secure your child in the car seat, buckle the harness, and tighten the harness by pulling on the harness adjuster strap.
  • Using your thumb and pointer finger, try to pinch one of the harness straps at your child's collar bone level.
  • If you’re able to pinch the strap, the harness is too loose. You should not be able to pinch any excess webbing.
Tightening the Harness Snug Vs. Not Snug
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