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My 5 year old is around 3'8"/45 lbs. and still rides in his forward facing car seat, a Britax Marathon. Since he's getting older now, I want to put him in a booster seat instead. All of his friends are using them now (and have been for a few years). I'm not sure which is safer or if it even matters.

Any links to good research about this would be helpful. Thanks.

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Well it looks like I'm easily looking at 6 years plus according to this new study. Article –  Dennis Apr 8 '11 at 19:41

3 Answers 3

up vote 4 down vote accepted

The American Academy of Pediatrics recommends that once children transition from rear-facing seats, they should stay in forward-facing seats with a harness until they exceed the maximum weight or height for that seat. At that point, they should move on to a booster seat and shoulder belt.

For the Britax Marathon, this means your child should stay in it until he is either 65 lbs, or the maximum recommended height (couldn't find the height limit on their website).

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Check your local laws. Car seat use long ago stopped being just about safety and began being about scoring legislative points. If you live anywhere in the US, these transitions are likely heavily regulated to the point that you don't actually have a choice in the matter.

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I'd go by what the local DMV/State specifies.

NYS states:

Booster seats are for children who have outgrown convertible or toddler seats. Booster seats are for children who are four to eight years old, weigh 40 to 80 pounds, and are less than four feet, nine inches in height. You can use a booster seat until an adult seat belt correctly fits the child without use of the booster seat. Always use both the shoulder and lap belts with a booster seat. Never use only the lap belt with a booster seat.

TN law specifies (more fitting to your situation):

Children age four (4) through age eight (8), and measuring less than four feet nine inches (4'9") in height, must be secured in a belt-positioning booster seat system, meeting federal motor vehicle safety standards in the rear seat, if available, or according to the child safety restraint system or vehicle manufacturer's instructions. (Note: If the child is not between age four (4) and age eight (8), but is less than four feet nine inches (4'9") in height, he/she must still use a seat belt system meeting federal motor vehicle safety standards.)

Both results were found googling "booster seat [state]"

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