Federal safety regulators recalled nearly 800,000 child safety seats made by Dorel Juvenile Group, saying they do not always lock properly.

The recall covers certain infant, convertible and booster child restraint systems that were made between May 2008 and April 2009, the National Highway Traffic Safety Administration said Monday. The seats were sold individually or as part of a “travel system” with a stroller.

NHTSA said the harness locking and release button on the seats does not always return to its locked position, which could lead to loose straps. In the event of a crash, the child wouldn’t be tightly fastened in, which could result in injuries, the agency said.

As a remedy Dorel will send registered owners a small tube of “food-grade lubricant” that is designed to prevent sticking and ensure that the harness button works properly.

NHTSA said consumers can continue to use the seats until the lubricant is applied, but the agency said caregivers should make sure harness is properly adjusted and locked.

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(Source: CNN)