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Results are being released Thursday morning on the latest tests on child booster seats.

The results should make manufacturers as well as parents very happy.

A car crash is violent, even when a child is properly restrained during a car crash. It's possibly fatal when they're not.

Now, new testing by the Insurance Institute for Highway Safety concludes at least manufacturers are making better booster seats.

"So this year there are 31 new booster seats on the market. Nineteen of those are in the Institute's top rating of Best Bet," said IIHS's Jessica Jermakian.

Seats like the Britax Parkway SG in highback mode, or the Harmony Transit Deluxe received top ratings because the lap belts lie flat across the upper thigh and the shoulder belt fits snugly across the center of the shoulder.

"It's not sliding off the shoulder or riding up on the neck," Jermakian said.

Two boosters, both from Dorel Juvenile Group, ended up on the Institute's "not recommended" list.

Although Dorel says both "...are in compliance with and exceed all federal requirements for child restraint systems."

Boosters have proven effective at protecting children, but experts say there's no need to rush your child into one.

"The Institute recommends that parents keep their children in a harness-based restraint for as long as possible up to the height and weight limit of the seat," Jermakian explained.

That generally means somewhere between ages 4 and 8.

Go to IIHS.org for a full list of ratings of booster seats, including a breakdown by manufacturer.

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