The car seat laws in Massachusetts require that children under the age of 8 and under 57 inches tall must be secured in a federally-approved car seat or booster seat. Here are the specific requirements:
- Children under the age of 2 must be secured in a rear-facing car seat. Once they reach the age of 2, they can be secured in a forward-facing car seat.
- Children ages 2-4 and weighing between 22-40 pounds must be secured in a forward-facing car seat with a harness.
- Children ages 4-8 and under 57 inches tall must be secured in a booster seat. Once they reach the age of 8 or the height requirement, they can use a regular seatbelt.
It’s important to note that children under the age of 13 must always ride in the back seat of a vehicle.

As a parent, one of the most important things is to keep children safe by ensuring they’re suitably restrained in a child safety seat. While it may seem like a hassle to take the time to strap them in each and every time you go for a drive. But it is a badly needed job to do to prevent high damage from an accident or even death.
According to Safe Kids Worldwide, car accidents are the leading cause of death for children aged 1-13. In fact, over 1,300 kids under the age of 13 die in car crashes each year in the United States alone. But this death ratio can be decreased by the proper use of child safety seats.
A variety of different types of child safety seats are available on the market, so it’s important to choose one that is appropriate for your child’s age, weight and height. It’s also important to make sure the seat is installed correctly. According to NHTSA, three out of four car seats are not used or installed correctly.
Why Are Car Seat Laws Important?

Car seat laws are in place to ensure the safety of children while traveling in motor vehicles. According to the Centers for Disease Control and Prevention (CDC), car seat use reduces the risk of death for infants by 71% and for toddlers by 54% in passenger vehicles. In addition, booster seat use reduces the risk of serious injury by 45% for children ages 4-8 when compared to seatbelt use alone.
Massachusetts booster seat law (Updated 2023)
The Massachusetts booster seat law requires that all children under the age of 8 or under 57 inches tall must ride in a federally-approved booster seat. Booster seats help to position the lap belt and shoulder belt correctly on the child’s body, which provides the greatest amount of protection in a car crash.
Children should ride in a booster seat until they are big enough to fit correctly in a seat belt. This means that the lap belt should sit low on the hips and the shoulder belt should cross the chest between the neck and arm. Children are generally ready to transition from a booster seat to a seat belt when they are 8 years old and 57 inches tall, but it is important to check their fit to make sure.
What Happens If You Don’t Follow the Car Seat Laws in Massachusetts?
If you don’t follow the car seat laws in Massachusetts, you may be fined up to $25 for a first offense and up to $50 for subsequent offenses. In addition, you’ll be required to attend a child passenger safety class.
What Are Some Tips for Using Car Seats Safely?
Here are some tips for using car seats safely:
- Always read the manufacturer’s instructions before using the car seat.
- Make sure the car seat is installed correctly. You can have it checked by a certified child passenger safety technician.
- Make sure the harness straps are snug and the chest clip is at armpit level.
- Never use a car seat that has been in a moderate to severe crash.
- Never use a car seat that is expired or that has missing parts.
- Don’t leave your child unattended in a car, even for a short amount of time.
Resources for Car Seat Laws in Massachusetts
Here are some resources for more information on car seat laws in Massachusetts:
- Massachusetts Child Passenger Safety: https://www.mass.gov/ This website provides information on car seat laws in Massachusetts, as well as tips for using car seats safely and information on car seat inspections.
- Massachusetts RMV: The Massachusetts Registry of Motor Vehicles provides information on car seat laws, including fines for non-compliance.
What car seat rules in Massachusetts?
In Massachusetts, specific car seat laws are passed to ensure a safe ride for your child. According to different types of car safety seats, booster seats, child’s ages and sizes rules are,
- Rear-facing car seats – Infants and toddlers must be in a rear-facing car seat if they’re under 2 years old.
- Forward-facing seat- Forward-facing car seat with a harness for children 2-4 years old and weight more than 40 pounds.
- Child booster seat laws– 4-8 years old and weight more than 40-80 pounds, they can use a booster seat.
- If children are under 8 years old but weigh more than 80 pounds, they can use an adult seat belt.
- Front passenger seat laws – Children are not allowed in the front seat before they’re 13 years old, and all other passengers must use a seatbelt while riding in the front seat.
Note: All types of car safety seats and booster seats must be secure with a lap and shoulder seat belt. The seat belt must be properly adjusted and fastened.

Frequently asked questions about car seat rules in Massachusetts
- Legal age front seat Massachusetts?
13 years old is the legal age for front seat riding in a car.
- Infant car seat laws in Massachusetts?
They should use a rear-facing car seat in a rear seat.
- when can a child sit in the front seat in ma?
In Massachusetts, according to state law, children under 13 years old are not allowed to sit in the front seat of a motor vehicle. Unless all rear seats are occupied by other children under 13 years old or the vehicle has no rear seats.
- What height do you have to be to sit in the front seat in Massachusetts?
According to Massachusetts law, children under the age of 13 must sit in the back seat of a car, unless they are taller than 57 inches (4 feet, 9 inches) or weigh more than 40 pounds. Children who meet these criteria may sit in the front seat of a car, but they must be properly secured in a child restraint system or a seat belt.
- Booster seat requirements in Massachusetts
Massachusetts state law requires that all children under the age of 8 or under 57 inches tall must ride in a federally approved belt-positioning booster seat.
This means that once your child outgrows their forward-facing car seat with a harness and tether, they need to move to a booster seat until they are big enough to fit in a seat belt properly.
Final Verdict
Knowing the car seat laws in Massachusetts is crucial for the safety of young children while traveling in motor vehicles. By following these laws and using car seats safely, we can reduce the risk of serious injury or death in the event of a crash.
It is important to remember that car seats and booster seats are not one size fits all, so be sure to consult an expert (like your nearest AAA office) to find the best option for your child’s individual needs. And always make sure that your car seat or booster seat is properly installed before each trip!