infant car seat heights

Have infant car seat but my 6 1/2 month old is almost too big. What is the next carseat?

Is there a better brand I should get? She goes to the doc tomorrow but I think she weighs about 18lbs. I don’t know her height.

A convertible carseat. Here is a link to a 3 in 1 convertible carseat. http://www.amazon.com/Graco-Nautilus-Car-Seat-Matrix/dp/B0011URFRE

Remember your child should stay rear facing for as long as possible.

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