[MnMadhouse]

I agree with PP. I would actually look into getting your youngest a new seat vs your oldest a new one. There are so many great seats out on the market that are lesser in price and have great features. Evenflo Triumph ADVANCE will RF to 35lbs and FF to 50lbs.

When your oldest gets closer to outgrowing the Marathon, the seat will likely be getting close to expiration (6 years from date of manufacture) and you can re-evaluate your situation then.

	Forward Facing Car Seats A forward-facing car seat is one in which the child sits facing the front of the car. The seat should be installed in the back seat of your vehicle. Most forward-facing only seats are for children above 20 pounds.

	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.