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Also, if your infant is tall, don't just go by the height listed on the seat. You may also need to go by where their head hits the top of the shell (usually needs to be 1" below the top). For example, my infant carrier said up to 30lbs and 30". However, even at 23 inches or so, my daughters torso was so long that when sitting her head was within in inch of the top of the seat.

As long as it's rear facing it is fine. They usually are approved for use from birth on up. We will be using an infant carseat but I plan to get a convertable once LO is 5-6 months.

Try out the carseats in the store before buying, if you can.

We originally were going to purchase just a convertible to use from birth. And when we bought it for my sister, we installed it in her car and found out the recline wasn't as reclined as it needed to be for an infant! We were so disappointed, and she ended up having to purchase an infant seat as well.

Make sure you know what the correct recline angle is and that the carseat can go to that angle in your car, and that your LO is comfortable.

Some convertibles, although they say 5lbs+, don't recline hardly at all. So it's really like 22 lbs+.

I already purchased a Britax when they were phasing out the old models. But I'm waiting until she either hits the weight or height limit. She'll likely hit the height limit soon. She's 4months and I think she's only 2" from the top now.

I am a Child Passenger Safety Technician and the previous posters have it right on- a convertible seat can be used from birth if used in a rear facing position and it is a good fit for the infant. You will get a long life out of a convertible seat if you begin using it at 4 months but be sure to read the manufacturers height/weight requirements and keep her rear facing as long as possible following those requirements. If you are at all unsure see if you have a local agency that offers individual car seat inspection/fitting checks. Cheers!