It is preferable to purchase newborn baby car seats which are fitted with a 5 point harness rather than a 3 point one as they keep the child in place more securely. Plus these also tend to fit around your baby much better and reduce the risk of them being ejected from it should the vehicle they are travelling in be involved in a collision. As with the harnesses in the seat look for those that come with a two piece chest clip as these can help to reduce the harness straps from twisting plus they are much easier for you to use. Yet they are designed in such a way that children won't be able to detach them.
There are some car seats that you can look into that can be converted from infant seats to a baby seat and then a booster seat. These are usually a bit more expensive at first, but certainly beat having to have a seat and then purchase additional seats as your little one gets older. While you may not realize it, your child can easily be in one until five or even six years old.
Most of the latest car models are equipped with provisions for infant seats. See if your vehicle has them and what type of latches and locks does it have. If your vehicle is built with them, they're usually mentioned in the manual. It would be best to look for a car seat that exactly matches the infant seat safety latches of your vehicle.
Make sure that the car seat you choose for your baby comes with built in locking clips as these ones not only make it easier for you to install the seat in your car. Also you will find that they secure the seat more tightly in the position they are placed in the vehicle, again reducing the child becoming injured if the vehicle is involved in any kind of accident.
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