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Whether you go with a convertible or infant seat, buying a seat from someone you don't know is not recommended. You don't know if the seat has been in an accident or if it's safe for your child.
  I'm all for hand-me-down baby stuff.  We had great friends pass down bags of clothes, a mini swing, bouncy seat, co-sleeper, toys, you name it!  But, a car seat is one of those things that really must be bought new.  If a used car seat has been damaged (accident, dropped, checked as baggage in an airplane and tossed around, straps washed, etc.) it could very well not protect your child's life in an accident. Â
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If you have a little time to search around online, you can likely find the Coccoro for $150-160. Â Babies often outgrow the seat RF at 2-2.5, at which time you could pass down the Marathon to RF longer, if you choose. Â So, for a solid 24 months of use (and a comfortable fit in your tiny car!) it'd be worth the $13/month or so it would average to know that your child is undoubtedly safe.
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My baby didn't fit properly in the Marathon until he was about 5 months adjusted age. Â Other shorter-torsoed babies don't fit well until they are much older. Â A friend's baby still didn't fit at a year! Â The straps must be at or below the baby's shoulders when RF. Â The 5 pound weight limit on the Marathon is quite deceiving. Â I wonder if there's ever been a 5 pound baby who had a 10 inch torso?! Â If you look closely in the manual, it does say that another seat might be necessary before the child can safely ride in the Marathon, because of the strap height issue. Â Plus, at a 45* newborn angle, the Marathon takes up quite a bit of front-to-back room.
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For your DS, it sounds like you need a FF car seat that's not as high up on a base like the Marathon. Â The Evenflo Maestro ($80), Graco Nautilus ($150), and the Britax Frontier ($250) are all good seats to look into. Â They don't have tall bases, so kids sit lower. Â The Maestro is probably the most compact, followed by the Nautilus. Â The Frontier is a pretty big seat, so make sure to try before you buy. Â Babies R Us generally carries all three of these models in their stores, so you can take them all out to test in your car. Â All three have nice tall harnesses to keep kids harnessed until at least 5-6+, and they all make good boosters. Â The Maestro booster doesn't adjust higher, like the other two do, so a dedicated booster would be in your future years down the line.