New Hampshire’s car seat laws require every child under seven years old and shorter than 57 inches to ride in a federally approved child restraint system, and every passenger under 18 to wear a seat belt. The rule comes from RSA 265:107-a, and the driver is the one held responsible if a young passenger isn’t properly secured.1New Hampshire General Court. New Hampshire Code 265:107-a – Child Passenger Restraints Required
What the Statute Requires
The threshold is age and height together. A child under seven must ride in a child safety seat that meets federal safety standards (49 C.F.R. section 571.213) unless they are already at least 57 inches tall. Once a child turns seven or reaches 57 inches, the child restraint requirement ends, but the seat belt requirement does not: every passenger under 18 must wear a properly adjusted seat belt on every trip, and drivers under 18 must wear one even when they have no passengers.1New Hampshire General Court. New Hampshire Code 265:107-a – Child Passenger Restraints Required
One point that surprises many families: New Hampshire is the only state without a mandatory seat belt law for adults 18 and older. The statute’s belt requirement reaches only passengers and drivers under 18. The child restraint and youth belt provisions, though, are fully enforceable, and the ticket goes to the driver.
Choosing the Right Seat by Stage
The statute doesn’t spell out which type of seat a child needs at each age. It requires a federally approved restraint until the child ages or grows out of the rule. Federal guidance and manufacturer limits fill in the rest, and there are three stages to move through.
Rear-Facing Seats
Rear-facing seats cradle a child’s head, neck, and spine and spread crash forces across the strongest parts of the body. NHTSA recommends keeping children rear-facing until they reach the maximum height or weight limit set by the seat’s manufacturer, not until a particular birthday.2National Highway Traffic Safety Administration. Car Seat Recommendations for Children
For most convertible seats, that means well past a second birthday. Turning a child forward-facing early because their legs look cramped is a common mistake. Bent legs are normal; an underdeveloped spine absorbing frontal crash forces is not. Harness straps should sit at or below the child’s shoulders, the seat should recline at the angle specified in its manual, and it should never go in front of an active airbag.
Forward-Facing Seats
Once a child outgrows the rear-facing seat’s limits, they move to a forward-facing seat with a five-point harness, which spreads crash energy across the shoulders, hips, and chest. Keep your child harnessed as long as the manufacturer allows. Many forward-facing seats accommodate children up to 65 pounds or more, so plenty of kids can stay harnessed through kindergarten and beyond. Harness straps should sit at or above the shoulders and be tight enough that you can’t pinch excess webbing. Secure the seat with either the vehicle’s seat belt or the LATCH system, not both, unless the manufacturer specifically says otherwise.
Booster Seats
A booster has no harness of its own. It lifts the child so the vehicle’s lap and shoulder belt fit properly. A child needs a booster when they’ve outgrown the forward-facing harness limits but aren’t yet big enough for the vehicle belt to sit correctly on its own. Proper fit means the lap belt rides low across the upper thighs and the shoulder belt crosses the chest and shoulder without cutting into the neck or slipping off.3National Highway Traffic Safety Administration. Car Seat Finder Tool
High-back boosters work well in vehicles without built-in headrests. Backless boosters are fine when the headrest sits at or above the child’s ears. Either way, always use a booster with a lap-and-shoulder belt, never a lap-only belt.
When a Child Can Use the Seat Belt Alone
Legally, the child restraint requirement ends at seven or 57 inches. But many seven-year-olds are nowhere near big enough for an adult belt to fit safely, and NHTSA notes that many children between eight and twelve still need a booster.3National Highway Traffic Safety Administration. Car Seat Finder Tool
Before retiring the booster, run through the five-point fit test. Your child should be able to sit with their back flat against the vehicle seat, knees bent naturally at the seat edge, and feet on the floor. The lap belt must rest across the upper thighs, not the stomach. The shoulder belt must cross the center of the chest and shoulder without the child tucking it behind their back or under their arm. If any of those fail, the booster stays. A belt that rides up onto the abdomen can cause serious internal injuries in a crash, and a booster is what prevents that.
Even after the child restraint requirement ends, every passenger under 18 must still wear a seat belt, in any seating position.1New Hampshire General Court. New Hampshire Code 265:107-a – Child Passenger Restraints Required
Where the Seat Goes in the Car
New Hampshire law doesn’t require children to ride in the back, but safety data makes a strong case for it. NHTSA recommends that all children ride in the back seat at least through age 12.2National Highway Traffic Safety Administration. Car Seat Recommendations for Children
Front passenger airbags deploy with enough force to seriously injure a small child, and a rear-facing seat placed in front of an active airbag is especially dangerous because the airbag strikes the back of the seat directly. For children under 13, sitting in front of an airbag doubles the risk of serious injury in a crash. If your vehicle has no back seat or no other option, disable the passenger airbag before placing a child up front.
The center of the back seat is often the safest position because it’s farthest from side-impact zones, but not every vehicle makes it practical. Some center positions have only a lap belt, which won’t work with a booster. Others lack LATCH anchors in the center. Check both the vehicle’s manual and the car seat’s manual. A seat installed correctly in an outboard position beats a seat installed poorly in the center.
Exemptions
The statute carves out several situations where the child restraint requirement does not apply:1New Hampshire General Court. New Hampshire Code 265:107-a – Child Passenger Restraints Required
- Taxis, livery vehicles, and other cars regularly used to transport passengers for hire.
- School buses over 10,000 pounds, and lighter school buses manufactured without seat belts.
- Cars manufactured before 1968, before federal seat belt requirements existed.
- Antique vehicles, farm tractors, and motorcycles.
- Children whose individualized education program (IEP) includes a statement that restraints are contraindicated.
- Vehicles in a legally authorized parade traveling at 10 mph or less.
An exemption from the law doesn’t make the situation safe. Rideshare services like Uber and Lyft likely fall under the for-hire exemption, and neither company guarantees a car seat will be available. If you’re riding with a young child, bring your own seat and install it before the ride begins.
Fines
A driver who violates the child restraint or under-18 seat belt requirement faces a $50 fine for a first offense and $100 for any subsequent offense.1New Hampshire General Court. New Hampshire Code 265:107-a – Child Passenger Restraints Required Beyond the ticket, a violation can become evidence of negligence in a civil suit if an unrestrained child is injured in a crash.
Used, Expired, and Recalled Seats
Not every seat is safe to use, even when it looks fine. Before putting your child in any seat, check three things.
Verify it hasn’t been recalled. NHTSA maintains a searchable recall database where you can look up a seat by brand or model.4National Highway Traffic Safety Administration. Check for Recalls: Vehicle, Car Seat, Tire, Equipment
Check the expiration date, usually stamped on the shell or printed on a label. Seats typically last six to ten years from the date of manufacture. Plastic degrades from heat and UV exposure, harness webbing stretches, and the materials lose the structural integrity they need in a crash. An expired seat should not be used.
For a used seat, NHTSA recommends confirming that it has never been in a moderate or severe crash, that it has all its original parts and labels (including the manufacture date and model number), and that it comes with its instruction manual.5National Highway Traffic Safety Administration. Used Car Seat Safety Checklist If any piece of the history is unknown, skip it.
Replacing a Seat After a Crash
NHTSA recommends replacing any car seat involved in a moderate or severe crash, even if there’s no visible damage. A seat does not need to be replaced after a minor crash, but only if every one of these is true:6National Highway Traffic Safety Administration. Car Seat Use After a Crash
- The vehicle could be driven away from the crash.
- The door nearest the car seat was undamaged.
- No passengers were injured.
- No airbags deployed.
- The car seat has no visible damage.
If any one of those isn’t met, the crash counts as moderate or severe, and the seat should be replaced. Many auto insurance policies cover the cost. You’ll typically buy the new seat and submit the receipt for reimbursement. Check the manufacturer’s instructions too, since some require replacement after any crash regardless of severity.
Free Installation Checks in New Hampshire
Nearly half of all car seats have at least one installation error, according to a national study by NHTSA. Common problems include loose harness straps, incorrect recline angles, and using LATCH and the seat belt together when the manufacturer doesn’t permit it.
New Hampshire runs a network of free car seat fitting stations organized by county, staffed by nationally certified technicians who will check your installation and show you how to correct any problems. You can also find certified child passenger safety technicians through NHTSA’s inspection station locator or Safe Kids Worldwide’s search tool. Inspections are free, typically take about 20 minutes, and are worth doing every time you install a seat in a new vehicle or switch seat types. Bring your child, your car, and the seat.