WASHINGTON -- Child safety seats rated by the government have all been given A's and B's in the first scores handed down.

FOR MORE INFORMATION Child Safety Seat Ease Of Use Ratings Not All Restraints Work In Every Car

Only two of the 68 that were tested for ease of use got an A in every category tested by the National Highway Traffic Safety Administration. No seat got below a B for an overall rating.

Administration spokesman Jeffrey Runge said the new rating helps consumers -- while also helping manufacturers improve their products.

The seats were graded on ease of assembly, clarity of labeling and instructions, ease of securing a child in the seat, and also on whether the seat has features that make it easier to install.

However, even if the seats were easier to install, it could be the car that could be causing the problems, according to the Insurance Institute for Highway Safety.

Its new study shows that not all car seats fit with every car and its restraints. The new latch program is supposed to make it easier to anchor a seat into the seat of the car, but oftentimes the car itself may not be well designed for a car seat.

Ten different types of vehicles were chosen for the institute's study to find out which ones made buckling in easier and which ones were more difficult. Researchers with the institute say parents should always read two manuals -- the one that comes with the child seat and the vehicle owner's manual to make sure you can install it properly. Authorities say at least 8 out of 10 car seats are installed incorrectly.

"I think a lot of people when it's not easy to do, tend to just not do it. And I think for the safety of the children they should be doing it regardless of the ease of putting them in and out of the seats," said mother Monika Shinaut.

Experts say you should test out a carseat in your car before you buy to make sure you're getting a good fit.