State law page

Mississippi Booster Seat Laws & Requirements (2026)

Under 4 yrs in child restraint | 4-6 yrs and under 57" tall or under 65 lbs in booster seat

Field	Mississippi snapshot
Age requirement	Under 4 yrs in child restraint \| 4-6 yrs and under 57" tall or under 65 lbs in booster seat
Height requirement	See child-restraint rule; includes height language where listed.
Weight requirement	See child-restraint rule; includes weight language where listed.
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	Under 4 yrs in child restraint \| 4-6 yrs and under 57" tall or under 65 lbs in booster seat
Adult safety belt permissible	7 yrs or over or 57" or taller or 65 lbs or over
Verification level	Index source; official state verification pending

Sources

Law and source links

Safety guidance

Even when Mississippi 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.