Something that often gets passed up when thinking about having a newborn is car seats, and how to correctly use them. I can't stress enough how important car seat safety is.You get scared and protective when your child falls? So let's get protective on saving their lives in cars.
Let's start with the chest clip. It is called a chest clip for a reason, not a tummy clip. You want it even with child's nipples or arm pits.
This picture shows a correctly installed infant in an infant carrier.

Another important thing to remember is where the straps come out of the car seat. Make sure the straps are tight and secure, you should not be able to pinch them at all.
If your child is rear facing (AAP recommends to at least 2 years and 30lbs) the straps need to be at or BELOW shoulders.

If your child is forward facing they need to be at or ABOVE shoulders. Make sure the straps are tight and secure, you should not be able to pinch them at all.

When installing the car seat into the car it needs to be tight as possible. If you have the latch system use that, if not, seat belt. But NEVER both. This video shows the importance of making sure it is tight. You shouldn't be able to move the car seat when it is installed. Grab the base of it and shake, if it moves more than an inch, it needs to be tighter.
http://www.youtube.com/watch?feature=player_embedded&v=u7Ca-pehs34#!
Did you know winter coats are a big no no in car seats? Watch this video for further explanation:
http://www.youtube.com/watch?v=CNGT9eBL_gg&feature=player_embedded
Another big no no is aftermarket products. What is an aftermarket product? It is anything and everything that doesn't come with your car seat. They void the warranty and haven't been crash tested. So those cute car seat covers, are just that, cute but have not been tested to be safe. Bundle Me's, are the same thing, so stick with using a blanket.
Please, never buy a used car seat from an unknown source as you don't know the history of it. If a car seat is involved with a crash, even if it is minor, it could have caused damage to the frame that you can't see. Or what if they washed the straps? Washing the straps, breaks down the material they are made from and can cause them to snap, as well as not being fire resistant anymore.
When it comes to your children, you can never be too safe or too cautious with car seats.
Le'ts keep our kids safe in the car, as well as out.