We purchase 2 of each convertible seats we test. The seats are compared side-by-side to evaluate their performance in relation to one another in each metric ad one of each is sent to MGA for crash testing. Multiple testers used the seats in different vehicles, and we use 3-4 different vehicles in our ease of installation testing to get a better overall feel of each seat's average functionality and features. All products are used following the manufacturer's guidelines and under the supervision of a Child Passenger Safety (CPS) technician.
Before testing, we consulted with the National Highway Transportation Safety Administration (NHTSA) and a certified CPS Technician to assist in developing comprehensive tests for car seats. The car seat test plan and testing process were reviewed and monitored by Dr. Juliet Spurrier, BabyGearLab founder, mother of two, and a board-certified Pediatrician.
We conducted research and analyzed the crash test data of sled crash tests in professionally prepared reports. BabyGearLab contracted with the same test facility that is used by NHTSA to perform crash tests on car seats. We used the same testing protocol used by NHTSA in compliance with the FMVSS 213 standard. We used our test data with additional crash test data from NHTSA's test results to formulate an analysis of each seat.
Tests utilized a crash test dummy with sensors located in various body parts that record G-forces exerted on the dummy during testing. We reviewed and analyzed the results obtained from the sensors and rated the seats in comparison to one another. Our crash tests were conducted with a Hybrid III 3 YO Part 572 P dummy (3 year old test dummy) in a forward-facing position because NHTSA crash injury studies have shown that the risks of injury are far more significant when children are forward facing, and the heavier 3 yr old test dummy provides a more strenuous test of the seats. For those reasons, we consider testing with a heavier test dummy in a forward facing position to be more informative concerning differences that translate to injury prevention. The more a seat managed to exceed the Federal safety standards, the higher it scored in our analysis of the results. It is important to remember that all of the products for sale in the US comply with Federal safety guidelines. However, each seat we tested responded differently in the sled testing, and we believe the results can help differentiate the seats from one another.
Above is a video of one of our crash tests conducted on the Britax Marathon.
Ease of Install
We installed each seat in at least three vehicles of varying size and different makes from a compact sedan to a passenger truck. At least two different testers installed the seats according to the manual instructions, and each installation was overseen by a certified Child Passenger Safety technician to ensure they were properly installed. The installers then ranked each seat compared to the other seats in the group for ease of installation and the scores for all testers were averaged to create a final score for each seat. This methodology was repeated for installation using LATCH and the vehicle belt in both the rear and front facing positions.
Ease of Use
To test ease of use we used the seats the way they would be used under normal circumstances and scored their results compared to the other seats in the group. We used the buckles and chest clips, tightened and loosened the harness, adjusted the harness heights, removal and cleaning of the seat cover, and assessed LATCH storage to help determine how easy or difficult each seat is to use.
Testing comfort and quality are a bit more subjective than the other metrics. We compared each seat to one another and ranked each as it compared to the other products. The testing included the padding, fabric, positioning/infant inserts, materials used, shell construction, and the overall fit and finish. The feedback obtained from testers was then averaged to determine its final score.
All of the seats were weighed in their forward- and rear-facing configurations. They were also measured in their entirety with the width and weight having equal influence on the final score for size. Each seat was weighed using the same scale performed by the same tester. The seat weights were ranked from the heaviest to the lightest, and they are scored appropriately.