According to the recall notice on the Government's Consumer Affairs website, the fabric around the car seat's harness adjuster could get caught, allowing the shoulder harnesses to loosen without lifting the adjuster.
"If the harness is loosened the child restraint is no longer effective in restraining the child in the event of an accident or sudden braking, increasing the risk of injury," the notice says.
People with the car seats made between September 16, 2014 and March 12, 2015 are advised to contact manufacturers IGC Dorel to arrange for free replacement of the car seat's trim.