About 100,000 Graco highchairs are being recalled for repair because they can collapse if they are not fully opened and locked into place from the storage position, U.S. regulators said on Thursday.

Graco Children's Products Inc. is recalling the Graco Contempo Highchairs after receiving 18 reports of the chair collapsing. There was one report of an 18-month-old boy suffering a bruise on his foot, the U.S. Consumer Product Safety Commission said.

The highchairs were sold from December 2005 through December 2006 for between $100 and $130 at various retailers nationwide.

The recalled chairs have model numbers that begin with 3800, 3803, 3804, 3805, 3810 and 3811, followed by a three-letter fashion code.

The agency said consumers should contact Graco for a free repair kit, and can continue to use the highchair until they receive the kit as long as they make sure it is fully opened first.

Graco can be contacted at (877) 445-1312 or at http://www.gracobaby.com.