Federal car seat testing rules change Dec. 5

Nashville, TN. New federal testing standards for child car seats take effect for manufacturers on Dec. 5, 2026. The National Highway Traffic Safety Administration (NHTSA) issued these rules to improve safety during side-impact and frontal collisions. The changes apply to child restraints produced after the compliance date.

The update includes a new side-impact performance standard under FMVSS 213a. This test simulates a T-bone crash using a vehicle seat and door assembly. It targets portable child restraints recommended for children under 40 pounds or under 43 inches in height. Specific items like car beds and harness-only restraints are exempt from this side-impact requirement.

A separate frontal-impact test standard, FMVSS 213b, also becomes mandatory on Dec. 5. This update modifies how frontal crashes are simulated. Tests will use a seat design that better represents a modern vehicle back seat. Most restraints will be tested with a simulated lap-and-shoulder belt rather than the older lap-belt method.

Parents in Davidson County do not need to replace current car seats solely because of this deadline. A seat bought after Dec. 5 might have been manufactured before that date, so the manufacturing date determines which standard applies. Some producers have already met the newer requirements ahead of the mandatory date.

Owners should ensure their seats fit both the child and the vehicle. Installation must follow the manufacturer’s instructions. Users should verify the seat has not been recalled and remains within its usable life span. These checks apply regardless of when the seat was originally purchased.

Labeling requirements for forward-facing seats and boosters have also changed. Manufacturers must list a minimum forward-facing weight of 26.5 pounds. Booster seats must specify a minimum weight of 40 pounds. These numbers indicate when a child can move to the next stage, not when they must do so immediately. NHTSA advises keeping children in each stage until they outgrow the seat’s limits.