If not, will they fit five?
Five seats, yes, but you will have a hard time finding a vehicle that can safely fit six child or booster seats based on Cars.com's Car Seat Check results, which you can see here.
To secure six would require that the second and third rows both be able to fit three child seats across, and our editors have found only a handful of vehicles that can accommodate three seats in even the second row. The vehicles found here will give you a good shopping list with which to start.
Among those that can fit three across in the middle row are the giant-size GMC Yukon XL (a sibling of the Chevrolet Suburban) and the Honda Pilot. Alas, we could get only two seats into the third row of either. In another example, the Honda Odyssey minivan has tether anchors for six seats, but only two seats fit in the third row.
In our tests we use an infant-safety seat, a convertible seat and a booster seat, and our criterion is that a child sitting in the booster seat must be able to buckle the seat belt. Your results may vary based on the brands and types of seats you're using, so we strongly suggest you take your child and booster seats — all of 'em — with you to dealerships to see for yourself what works and what doesn't. Call ahead, not only to alert the dealership but to see if there is a certified car-seat expert on staff who can help.
Some SUV and minivan models come with only two seats in the second row instead of a three-seat bench (usually on higher-priced versions), so before you reject a vehicle for having too few seats find out if different seating arrangements are offered. If you really want to think big, consider full-size passenger vans, which can seat from eight to 15. They can be a handful to drive, however, and Cars.com has not conducted child seat checks on any full-size vans.
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