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I have a 2007 Mercury Mariner and I am expecting my third child this summer. I would really like to keep my vehicle but am unsure about fitting three car seats in the back. My daughter will be 4 1/2 by the time the new baby arrives and she is currently in a Graco Nautalus she is also still harnessed. My son will be one year old once the baby arrives. He is currently in a First Years Car Seat (but he will be switching to a convertible car seat by then). I am open to purchasing new car seats since that would be cheaper than a new vehicle I am just unsure where to even start. I would appreciate any information! Thanks!!