Child Car Seat Specifications — 25 Models, NHTSA Ratings + Verified Width (2026)

NHTSA ease-of-use ratings (securing, installation, instructions, recall count) merged with a manufacturer-verified overall width in inches for 25 convertible/combination child car seats. NHTSA's own childSeats dataset does not publish a comparable width field — this is the fit-critical number parents need to determine three-across seating and is independently sourced/cross-checked per model. 21 of 25 rows carry an NHTSA ID, 25 carry a verified width. Compiled and maintained by CarSeatFit (carseatmatch.com) — car seat matching by exact vehicle fit. Full site: https://carseatmatch.com/.