Britax Child Safety Inc. is recalling roughly 60,000 car seats. Children can bite off a piece of the harness pad and choke on it.

The recall is for car seat models Boulevard 70-G3, Advocate 70-G3 and Pavilion 70-G3 models sold in the U.S. and Canada.

The seats were made with softer chest pad material that can be bitten off and chewed by children, U.S. regulators said. The seats in the recall were made from June 11 to August 31.

In a letter to the U.S. government, Britax reports that three children bit off pieces and gagged on them.

Britax will send new pads for free to those who registered seats while others are able to call (888) 427-4829 for replacement pads.

The seats can be used without the pads until replacement parts are sent.