The National Highway Traffic Safety Administration (NHTSA) has issued a Consumer Advisory to alert owners of Baby Trend child safety seats that the seat base could fail and not protect a child during a collision.

The Baby Trend seats involved in the recall are the Magnum (model number 6439), Galaxy (model number 6481), Silverado (model number 6448), and the 6400S bases that were sold separately and manufactured between May 14, 2007, and April 1, 2008.

"Baby Trend is recalling the bases of these child safety seats because they could fail to adequately protect children in a collision. Baby Trend will replace the base free of charge," NHTSA warned on its Web site.

Owners of the affected seats should contact Baby Trend at 1-800-328-7363 to obtain a free replacement base.

"In the meantime, NHTSA is urging consumers not to use the car seat with the base," the federal safety agency cautioned.