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Three car seats on one bench is the hardest fit problem in baby gear, and listed dimensions are rarely the installed width. This page compares seats by how much room they actually take up once belted in, which ones puzzle together in a compact SUV, and which combinations are physically impossible before you buy the second seat.
The full ranking for this page is being finalised. Every product listed here is checked against manufacturer specifications before it is ranked, and this page is updated as models change.