State law page

Massachusetts Booster Seat Laws & Requirements (2026)

7 yrs or under and under 57" tall

Field	Massachusetts snapshot
Age requirement	7 yrs or under and under 57" tall
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	7 yrs or under and under 57" tall
Adult safety belt permissible	8-12 yrs or 57" or taller
Verification level	Index source; official state verification pending

Sources

Law and source links

Safety guidance

Even when Massachusetts 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.