by 
The Curious Bag
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<h4 class="dechead">On One Hand: Harnessed Seats Are Safer
The American Academy of Pediatrics states that children should remain in their forward-facing car seat with a harness until they have outgrown it either through weight or height, at which point they can be moved to a booster seat, provided they are four years old.
On the Other: Age and Weight Guidelines
Some prefer to move their child to a booster seat as soon as he or she is old enough or heavy enough. The National Highway Traffic Safety Administration emphasizes the age of four and a weight of 40 pounds as the indicators that a child is ready to change to a booster seat.
Bottom Line
The safest way to transport your child is in a harnessed car seat, but once this is outgrown a booster is considered safe. If your child outgrows the car seat before the age of four, the safest option is to buy a different car seat that is rated for your child's height and weight, because children should not be in a booster seat until they are at least four years old.
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