Chicco Onefit LX

The Chicco OneFit LX is an all-in-one car seat for children 5 to 100 pounds that transitions from harnessed mode to booster mode as your child grows. In CR’s tests, the Chicco OneFit LX provides excellent crash protection and secure installation in both rear-facing and forward-facing positions and with either LATCH or seat belt installations. Adjusting the harness is simple, but adjusting the crotch strap means you’ll need to first remove the seat pads, cup holders, and buckle cover, which is not as ideal. 

CR’s testers note that the seat is bulky and fairly heavy at 26 pounds. The seat’s weight has some drawbacks beyond making it harder to move the seat between cars, too: because the seat is on the heavier side, your child will only be able to use the seat inLATCH install mode up to 35 pounds in the rear-facing position, since the LATCH system has a weight limit that includes the weight of the car seat and the child rider. 

This seat may be a good choice for: 

• Families who want to purchase an all-in-one car seat (as opposed to using an infant seat for the first year and then switching to a convertible seat) 
• Families who don’t need to move their car seat between multiple cars
• Anyone who needs a simple and straightforward installation, thanks to the push-on LATCH connectors and seat belt lockoff 
   

Ease of use: Overall, the Chicco OneFit LX all-in-one car seat was very easy to use, with a simple and streamlined installation process, easily adjustable harness and headrest, easy open-close buckle, and push-on LATCH connectors.

Fit-to-vehicle LATCH: Installation was simple and secure, and the fit is excellent, though you may need to remove the backseat head restraint in some vehicles when installing in forward-facing mode.

Fit-to-vehicle belt: This car seat offers an excellent and secure fit when installing with the seat belt, though you may need to remove the backseat head restraint when installing in forward-facing position.

Booster fit: The OneFit does a very good job at positioning both the lap and shoulder belt correctly for booster aged children. Its wide base may be wobbly in some center seats and may need to be moved sideways to access the belts in others. Vehicle seatbacks with significant bolstering may have compatibility issues as the fixed side-impact bolsters may interfere.

Crash protection: In CR’s crash test protocol, this seat performed well and did not exhibit significant structural integrity issues.

Additional Information

Good to know: All child car seats sold in the United States are required to meet government safety standards. 

About our testing: Consumer Reports’ child car seat tests are not designed to test compliance with federal standards. Rather, we evaluate car seat performance under conditions designed by our experts that go beyond the required federal safety standards. Consumer Reports’ independent car seat crash test program has been carefully designed to simulate the forces encountered during a crash, while replicating some of the real-world factors that might impact a car seat’s performance. Our testing aims to determine which car seats could provide an extra level of safety when compared to other models in the same category. 

Basic, Better, or Best: CR rates the child car seats we crash test on a scale of Basic, Better, and Best, based on the additional margin of safety they may provide. Read about how we test car seats to learn more about our crash test protocol.

The Chicco Onefit LX is part of the Car Seats test program at Consumer Reports. In our lab tests, Harnessed Car Seats models like the Onefit LX are rated on multiple criteria, such as those listed below.

Ease of use: Our judgment of how easy each seat is to use including the clarity of labels and instructions, adjustments of clips and buckles, the transition of the seat between modes and installation features such as LATCH connections, belt paths, top tethers and booster guides.

Forward facing fit-to-vehicle: A rating of how compatible, easy and secure a child car seat can be correctly installed in the forward-facing direction. This rating is a combination of the LATCH system and belt ratings that are available individually on the model page.

Rear facing fit-to-vehicle: A rating of how compatible, easy and secure a child car seat can be correctly installed in the rear-facing direction. This rating is a combination of LATCH system and belt ratings that are available individually on the model page.