Car seat laws vary more than most parents expect, and Massachusetts is no exception. Below are the current Massachusetts requirements for rear-facing seats, forward-facing seats, boosters, and seat belts, verified against the official Mass.gov.
Law data last verified against official state sources: October 4, 2026.
Quick answer
Massachusetts requires a federally approved child passenger restraint, used per manufacturer instructions, until age 8 or 57 inches tall — then a properly adjusted seat belt until age 13.
Massachusetts car seat requirements by age and size
| Stage | What Massachusetts law requires |
|---|---|
| Rear-facing | Not specified on official source — state law requires a federally approved child passenger restraint properly fastened per manufacturer instructions until age 8 or 57 inches; no rear-facing age is codified. |
| Forward-facing | Not specified on official source. |
| Booster seat | Not separately specified on official source — the restraint requirement covers all children until they are 8 years old or over 57 inches tall. |
| Seat belt only | Age 8 OR over 57 inches tall; after outgrowing the restraint, children must wear a properly adjusted seat belt until age 13. Age 13+ must wear a seat belt (MGL Ch. 90 § 13A). |
Fines and penalties in Massachusetts
Fine: not published on the official state source. Note: a fine may be imposed under MGL Ch. 90 § 7AA (amount not stated on the official page).
Front seat rules in Massachusetts
Front-seat rule: not specified in state law. Note: .
The official law
- Statute: MGL Ch. 90 § 7AA
- Official source: Mass.gov
Massachusetts car seat law FAQs
What is the fine for a car seat violation in Massachusetts?
Fine: not published on the official state source. Note: a fine may be imposed under MGL Ch. 90 § 7AA (amount not stated on the official page).
When can my child stop using a booster seat in Massachusetts?
Not separately specified on official source — the restraint requirement covers all children until they are 8 years old or over 57 inches tall. Age 8 OR over 57 inches tall; after outgrowing the restraint, children must wear a properly adjusted seat belt until age 13. Age 13+ must wear a seat belt (MGL Ch. 90 § 13A).
Does Massachusetts law require rear-facing car seats?
Not specified on official source — state law requires a federally approved child passenger restraint properly fastened per manufacturer instructions until age 8 or 57 inches; no rear-facing age is codified.
Can my child ride in the front seat in Massachusetts?
Front-seat rule: not specified in state law. Note: .
Where can I read the official Massachusetts car seat law?
Statute: MGL Ch. 90 § 7AA Official source: Mass.gov.
Check another state
Driving across state lines? Requirements change at the border — use our interactive car seat law checker to look up any state by your child’s age, weight, and height.
Related state guides:
This page is for general informational purposes only and is not legal advice. Child passenger safety laws change — always verify current requirements with your state’s DMV, highway safety office, or the official statute linked below before making decisions.