State law page

New Hampshire Booster Seat Laws & Requirements (2026)

6 yrs and younger who are 57" or shorter

Field	New Hampshire snapshot
Age requirement	6 yrs and younger who are 57" or shorter
Height requirement	See child-restraint rule; includes height language where listed.
Weight requirement	No weight threshold listed in GHSA summary.
Fine / penalty	Verify fine with state source; GHSA notes first-offense fines vary by state.
Last checked	GHSA reviewed by SHSOs June 2025; extracted 2026-07-23
Verification level	Index source; official state verification pending
Child restraint required	6 yrs and younger who are 57" or shorter
Adult safety belt permissible	7-17 yrs (or under 6 yrs and 57" or taller)
Verification level	Index source; official state verification pending

Sources

Law and source links

Safety guidance

Even when New Hampshire law allows a seat belt, NHTSA, CDC, and AAP guidance may still recommend a booster until the vehicle belt fits properly.

Understand age, height, weight, and seat belt fit.

See when children typically start and stop using boosters.

Know when to move from harnessed seat to booster.