Fitting three car seats across one row is challenging but possible with the right combination of vehicle, car seats, and strategy. The most critical factor is your vehicle's interior width. You need to measure the actual space on the seat cushion, not just rely on the vehicle's class. The best car seats for this are typically narrow, lightweight models specifically designed for three-across configurations. Success often requires using the vehicle's seat belt system instead of the lower LATCH anchors, as the anchors are often spaced too widely to fit three seats side-by-side.
Start by identifying the narrowest point of your back seat—the actual seating surface where the child seats will rest. You'll need a tape measure for this. Many SUVs and minivans have a hump in the middle, so the narrowest spot might be at the outer edges. Once you have the measurement, you can research car seat dimensions. Look for models labeled as "slim" or "three-across." Some seats are as narrow as 17 inches, which makes a significant difference.
The installation method is key. While LATCH is convenient, the lower anchors are typically positioned too far apart for three seats. You will almost always need to use the vehicle's seat belt to install at least the middle seat, and often the outboard seats as well. Seat belts offer more flexibility in positioning. A common trick is to install the middle seat first, using your full body weight to compress the vehicle seat and get a tight fit. Then, install the two outboard seats, buckling them before tightening the straps to avoid overlapping buckles.
Here is a comparison of some popular narrow car seats to aid in selection:
| Car Seat Model | Type | Approximate Width | Key Feature for 3-Across |
|---|
| Diono Radian 3RXT | Convertible (Rear & Forward) | 17 inches | Steel alloy frame; narrow, foldable design |
| Clek Fllo | Convertible | 17 inches | Rigid LATCH system; premium materials |
| Graco SlimFit3 LX | Convertible | 19 inches | Compact design; easy installation |
| Chicco KeyFit 35 | Infant | 11.5 inches (at base) | Narrow infant seat base |
| BubbleBum | Booster | 11 inches (inflated) | Inflatable, portable booster for older kids |
Be prepared for a time-consuming process. It can take several attempts to find the right combination and achieve a proper, rock-solid installation for all three seats. Always check each seat independently; it should not move more than one inch side-to-side or forward at the belt path.
