Booster seat requirements in Mississippi
A car seat or booster until age 7.
Mississippi sets no height or weight that ends the requirement on age alone.
Condition Both size tests have to be cleared together. The statute requires a booster for a child aged four to six who "measures less than four (4) feet nine (9) inches in height or weighs less than sixty-five (65) pounds", so a child who is 4 ft 9 in but under 65 pounds still needs one, and so does a child over 65 pounds who is under 4 ft 9 in.
- Seat belt alone from
- age 7
- First offense
- $25
Every figure on this page was read at Miss. Code Ann. §§ 63-7-301, 63-7-309 on 4 October 2026. Read the statute
What the Mississippi booster seat law says
The stages below are separate rules in the statute, not one rule in steps.
| Rule | Figure | What Mississippi requires |
|---|---|---|
| Car seat or booster | under 7 years | Until age 7. Condition Both size tests have to be cleared together. The statute requires a booster for a child aged four to six who "measures less than four (4) feet nine (9) inches in height or weighs less than sixty-five (65) pounds", so a child who is 4 ft 9 in but under 65 pounds still needs one, and so does a child over 65 pounds who is under 4 ft 9 in. |
| Adult seat belt alone | from 7 years | Lawful from age 7. |
| Penalty | $25 | $25 for a first offense. Condition Section 63-7-309: not more than $25 for each offense. HB 1022 of the 2026 session would have raised it to $100 but died in committee on 3 February 2026, so $25 is still the figure. |
Where this and size guidance disagree, follow the stricter one. A belt that crosses the neck rather than the middle of the chest is worse protection than a booster even where the statute allows it.
The statute
Mississippi sets this in Miss. Code Ann. §§ 63-7-301, 63-7-309. Read it at the source.
This is information, not legal advice. A city or county in Mississippi can set a stricter rule than the state one, and an officer enforces the text of the statute rather than a summary of it. Where this page and the statute differ, the statute is right and this page is a bug.
Where this comes from
- Statute
- Miss. Code Ann. §§ 63-7-301, 63-7-309
- Source
- billstatus.ls.state.ms.us
- Jurisdiction
- Mississippi (MS), state law only
- Last reviewed
- 4 October 2026 0 days ago
- Read at the statute
- 4 October 2026
- Signed off by a person
- Not yet