[BookMama CPST]

I have easily installed a rear-facing Marathon in a 2004 Focus sedan and a Decathlon rear-facing in my 2003 Focus wagon. I think both have the same size back seat as your 2006 Focus. I don't think you'll have any problem fitting either seat in your vehicle.

	Rear Facing Car Seats A rear-facing seat is one in which the infant faces the back of the car. Always install a rear-facing seat in the back seat of your car. This is the safest position for an infant. NEVER place a rear-facing seat in the front seat of a vehicle with passenger airbags.

	Britax Marathon - Click for more info Increasing the time a child can safely stay in their convertible car seat is a big issue and Britax engineers have come through in a big way with the introduction of the Britax Marathon with LATCH. A LATCH Compatible Convertible Child Seat, the Britax Marathon can be used rear facing 5 to 33 pounds and forward facing from 20 to 65 pounds. Compare the numbers and you will see it is hard to find a seat with these weight limits that is safe and functional.

	Britax Decathlon - Click for more info Like its predecessors the Britax Roundabout and the Britax Marathon, the Britax Decathlon is built around two core ideals: safety and comfort. Its easy to see that the Decathlon is comfortable: it's loaded with a 3-position crotch strap, patented HUGS harness system, plush (and washable!) seat cover, belly pad, removable toddler head pillow, and an infant positioning system for newborn babies. These features provide a comfortable, adjustable fit as your child grows - all the way from 5 to 65 pounds.