The Consumer Product Safety Commission says babies can wiggle out of the floor seats.
In 2007, a million of the molded foam seats were recalled and labels warning against placing the seats on raised surfaces were added.
Since then, CPSC and Bumbo International of South Africa have learned of at least 50 incidents where babies fell from Bumbo seats while they were being used on raised surfaces. Also, the CPSC says another 34 babies fell from the seats while they were being used on the floor or at an unknown elevation. There were 21 reports of skull fractures.
The company said it was adding a restraint belt to enhance the safety of children using the Bumbo seat.
Consumers are being asked to stop using the seats and contact Bumbo for a free repair kit that includes a restraint belt and instructions on how to safely use the seat. The repair kit can be ordered by visiting www.recall.bumbousa.com or calling (866) 898-4999.
The seats involved in the recall have the word "Bumbo" in raised lettering with an elephant on the front of the seat. The bottom of the seat has the words "Manufactured by Bumbo South Africa Material: Polyurethane World Patent No. PCT: ZA/1999/00030." The back of the seat has several warnings, and seats manufactured since 2008 also have warnings on the front of the seat against use on raised surfaces.
The Bumbo floor seats were sold at Babies R Us, Target, Walmart and other retailers nationwide from August 2003 through August 2012.
