This is Child Passenger Safety Week.

It's child passenger safety week.

This is the time to make sure kids' car seats and seat belts are safely secured.

"73% of car seats are either installed wrong or misused," said Nick Aysseh with Yale New Haven Health Center for Injury and Violence Prevention.

Aysseh says the most common mistake people make is the harnesses in car seats are too loose.

"When we're testing for tightness, we want to do what's called the pinch test. And we want to take our thumb and our finger here and we want to try and pinch the material and a properly tightened harness you won't be able with a light pinch to get that webbing to touch," said Aysseh.

In Connecticut, children under 2 must be rear facing in the car.

A child must be in a five-point harness with a chest clip until they're at least 5 years old and 40 pounds.

And must be in either a car seat with a harness or a booster until they are both 8 years old and 60 pounds.

"A properly fitted booster means that the lap belt is going to go over the hips, the boney part of the hips and not on her belly and if you notice the shoulder belt is actually on the shoulder," said Aysseh.

Aysseh says if a car seat is installed properly, you'll have less than one inch movement from side to side.

Experts say if you are caught by police with an improperly installed care seat you could face a fine or be forced to take a safety class. If you fail to take the class, your license could be suspended.

This Saturday, Yale New Haven Health will be holding a Car Seat Safety Day.

It's at the Westport Train Station from 8 a.m. to 12 p.m. -- where you can have your car seat installed free by a certified passenger safety technician.