In Maryland, booster seat requirements apply to every child under eight years old who has not yet reached 4 feet 9 inches in height. Until a child clears that height, or has an eighth birthday, state law requires a child safety seat — which includes forward-facing harnessed seats and booster seats — installed according to both the vehicle and the seat manufacturer’s instructions.1Maryland General Assembly. Maryland Code Transportation 22-412.2 An officer can pull you over for an unrestrained child on its own, so this is not a rule that only matters if you get stopped for something else.
Who Needs a Booster
Maryland groups rear-facing seats, forward-facing harnessed seats, and boosters under a single legal term: “child safety seat.” The law requires one for every child under eight unless the child already stands 4 feet 9 inches tall.1Maryland General Assembly. Maryland Code Transportation 22-412.2 In practice, most children move from a harnessed car seat into a booster somewhere between ages four and six, once they have outgrown the harness by height or weight.
The height threshold matters more than the age cutoff, and it cuts both ways. A child who turns eight but still stands well under 4 feet 9 inches is no longer covered by the booster mandate as written, though safety experts recommend keeping a shorter child in a booster until the adult seat belt fits properly. A tall six-year-old who already measures 4 feet 9 inches can legally use the regular seat belt. The point of the height rule is proper belt fit; the number is an approximation of when most children’s bodies are built to use an adult belt safely.
Maryland does not set a minimum weight for the booster requirement itself. Every booster, however, carries a manufacturer-specified weight range on its label. A child who falls below or above that range is not properly protected by that particular seat, so always check the label rather than guessing.
High-Back or Backless?
Both types are legal in Maryland. A high-back booster has a shell that rises behind the child’s head and shoulders; a backless booster is a cushion that lifts the child so the vehicle belt crosses at the right points.
Research published in Injury Prevention found that high-back boosters reduced injury risk by roughly 70% in side-impact crashes compared with a seat belt alone, while backless boosters did not show a statistically significant improvement in those same crashes. The design difference matters because the high-back shell contains the upper body and keeps the shoulder belt sitting on the collarbone, which limits how far the head and torso move during a side impact.2PMC (PubMed Central). Effectiveness of High Back and Backless Belt-Positioning Booster Seats in Side Impact Crashes
If your rear seats have built-in headrests that reach above your child’s ears, a backless booster offers reasonable head support. If they do not, go with a high-back model.
When Your Child Is Ready to Stop
Hitting the legal threshold does not automatically mean the adult seat belt fits. The whole purpose of a booster is to lift a child so the belt sits in the right places, and plenty of children who meet the eight-year or 4-foot-9-inch mark still get a poor fit without one.
Before putting the booster away, run through a short check. Your child should sit all the way back against the vehicle seat with knees bending naturally at the seat edge. The lap belt should lie flat across the upper thighs, not ride up onto the stomach. The shoulder belt should cross the chest and collarbone, not cut into the neck or slide off the shoulder.3NHTSA. Car Seat Recommendations for Children If any of those conditions fails, the booster stays.
Belt fit varies between vehicles, too. A child who passes the test in your SUV might fail it in a sedan with a differently angled rear seat. If your family uses more than one vehicle, check the fit in each one.
NHTSA also recommends keeping children in the back seat at least through age twelve, even after they outgrow a booster. The back seat puts the most distance between a child and the forces of a frontal crash or a deploying passenger-side airbag.3NHTSA. Car Seat Recommendations for Children
Narrow Exceptions
Maryland allows only a handful of situations where the booster requirement does not apply.
- A physician licensed in the state where the vehicle is registered can certify in writing that a child safety seat is impractical because of the child’s weight, height, physical condition, or another medical reason. The certification must explain why the seat cannot be used.1Maryland General Assembly. Maryland Code Transportation 22-412.2
- Class L (historic) vehicles are excluded from the law’s definition of “motor vehicle” and typically lack rear seat belts.4Maryland General Assembly. Maryland Code Transportation 22-412.3
- Vehicles that were never required to have seat belts under federal safety standards are not covered, and Maryland does not require retrofitting belts into them.4Maryland General Assembly. Maryland Code Transportation 22-412.3
These are narrow. There is no exemption for short trips, inconvenience, or borrowing a friend’s car.
Taxis Versus Rideshares
Here is a distinction many parents miss. Traditional taxis are exempt from Maryland’s child restraint law. Rideshare services like Uber and Lyft are not.5Maryland Department of Health. What Do Caregivers Need to Know about Maryland’s Child Passenger Safety Law? If you order a rideshare for a child under eight, the booster requirement still applies, which usually means bringing your own seat and installing it before the ride.
Even in an exempt taxi, Maryland’s KISS program recommends using a car seat or booster. Crash physics do not care who owns the vehicle.
If You Get Stopped
Child restraint violations are a primary offense in Maryland, so an officer can stop you solely because they see a child who is not properly restrained.6MIEMSS. Talking Points About Maryland’s Updated CPS Law The statutory fine is $50, and with court costs the total comes to $83.7Maryland Courts. Traffic Fine Schedule If more than one child is improperly restrained, each child counts as a separate violation.
A judge can waive the fine entirely if you did not own a car seat at the time of the stop, bought one before your court date, and bring proof of purchase to your hearing.1Maryland General Assembly. Maryland Code Transportation 22-412.2 The law was written to get children into proper seats, not just to collect money.
The violation carries zero points on your Maryland driving record.7Maryland Courts. Traffic Fine Schedule It still appears as a traffic offense, and Maryland insurers are permitted to consider traffic violations from the past three years when setting premiums.8Maryland Insurance Administration. Automobile Insurance Rates Whether a zero-point ticket actually moves your rate depends on the insurer.
Free Help With Your Seat
Maryland runs the Kids in Safety Seats (KISS) program through the Department of Health, and every service is free. KISS offers in-person car seat checks at events around the state, virtual appointments over Zoom for installation help, and a reduced-cost purchase program for families who qualify financially.9Maryland Department of Health. About Kids in Safety Seats (KISS) You can reach the helpline at 800-370-SEAT (7328) or email mdh.kiss@maryland.gov to book an appointment or ask about the law.10Maryland Department of Health. Kids In Safety Seats (KISS)!
If you are not certain the booster is installed correctly or that the belt is routing the right way across your child, a certified technician can usually spot and fix the problem in a few minutes. National data consistently shows that a large share of car seats are misused in ways parents never notice.