How to Safely Match a Car Seat with Your Car

Research says that child car seats and vehicle seats don't align properly more than 40% of the time. Here's how to pick the right restraint for your car.

car seat safety
Photo: Maria Sbyotva/Shutterstock

You probably spent a few hours researching car seats for your baby, but did you factor in car size and seat angles? When scientists from The Ohio State University College of Medicine checked compatibility between 61 vehicles and 59 child car seats on the market, they found that the two were not correctly aligned more than 40% of the time—putting children at risk.

But before you get too worried, the researchers also noted that none of the cars or car seats were unsafe.

"I want to emphasize that all car seats are safe and have passed federal regulations. But, to really optimize the safety of a child's car seat and provide the best protection for the child, one must make sure it fits properly in the vehicle," said Julie Bling.

To ensure that your child's car seat is the safest it can be, lead study author Julie Bing, a research engineer at Ohio State College of Medicine's Injury Biomechanics Research Center, has these savvy shopping tips and safety advice based on what she learned.

Research the Car Seat in Person

Go to the store and ask the sales clerk if you can test the floor model in your vehicle. Be realistic about the size of your car when choosing a car seat.

"If you don't have a large vehicle, don't buy the biggest, bulkiest child restraint out there, even if it has all the bells and whistles and best safety ratings and fanciest-looking padding," Bing suggests. "If it doesn't fit correctly in your vehicle, that might not be the safest option."

She says the smaller restraints are still perfectly safe; make sure you get a fit that's nice and tight and not interacting with the vehicle in any way it's not supposed to. Then, consider how the seat will fit in each car you plan on using.

Visit a Car Seat Check Event

If you already own the seat, visit a car seat check event, like those listed at, and have the experts show you how best to install that model. They might show you that your car seat needs to be moved to a different seating position in the backseat, as sometimes the center seat works better than the outboard and vice versa, Bing says.

Tip: Call Your Local Fire Department

Many fire departments around the country will host car seat check events through out the year, try calling your local fire department and ask if they're hosting one soon.

Read the Instruction Manual

Just like you wouldn't try to put your baby's crib together without reading the directions, it's crucial to get acquainted with your car seat's manual, Bing says. The instructions will tell you what the installation should look like and if it's allowed to touch anything in the vehicle, what angle it's supposed to be at, and how tight it's supposed to be positioned in your car, she says.

If your car seat has safety issues like a broken clasp or a missing piece, you can use the manual to find the manufacturing contact information to replace that car seat.

Make Sure You Understand Their Car's Installation

Anyone caring for your child and driving them around should know how to use the car seat. Each restraint and vehicle seat combination will be a little different, so it may be worth encouraging your in-laws or babysitter to attend a car seat check event.

"If a caregiver takes a car seat to a check-up event, they're going to get personalized instruction on how to use that car seat for their vehicle," Bing says.

Be Mindful of Rear-Facing Seat Angles

"The biggest incompatibility we saw was the angle of rear-facing car seats," Bing says. Each rear-facing seat has a sticker, label, or marble that rolls around, telling you the angle the child is supposed to be sitting once the seat is installed.

"A lot of times, we found the angle of the vehicle seat didn't provide the proper angle for the child restraint," Bing says. "We discovered the child was sitting too far upright in 30% of the combinations we looked at." Make sure the seat is installed at the angle the manufacturer designed and tested it for so it'll provide the best safety performance.

"One of the most surprising things we saw was that if this rear-facing angle was too far upright, there might be medical concerns for newborns as well as safety issues," she says. "If you have a newborn infant who can't support their own head and the angle they're sitting at is incorrect, their head can fall forward, and the airway can be cut off."

It's especially important to get that angle as recommended by the manufacturer, Bing says. Your best bet for perfecting this would be to have a professional look at the installation so they can make adjustments as needed.

Learn more about car seat safety on the National Highway Traffic Safety Administration's Parents' section.

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