WASHINGTON – Around 4-million Bumbo baby floor seats have been recalled in Canada and the United States after nearly two dozen reports of skull fractures.

Health Canada said infants can arch their backs and flip or maneuver out of the seat, posing a risk of serious injuries or fall.

Around 341,991 units of the recalled seats were sold in Canada, while around 4,325,710 units were sold in the U.S.

Consumers can register for the retrofit kit by calling 1-866-477-5144 between 8 a.m. and 5 p.m. Monday through Friday, or via Bumbo Canada’s website.

Click here for more information on the recall notice from Health Canada.

The seats are manufactured by South Africa’s Bumbo International, of South Africa, and imported by Oyaco Products Inc., of Calgary, Alta.

The recalled products were sold from August 2003 through August 2012 at various children’s stores nationwide and online retailers.

Around one-million of the molded foam seats were recalled in October 2007 for additional warning labels against placing the Bumbo seats on raised surfaces, such as tables or kitchen counters.

Since the first recall, CPSC and Bumbo International of South Africa have learned of at least 50 incidents in which babies fell from Bumbo seats while they were being used on raised surfaces.

The CPSC said another 34 babies fell from the seats while they were being used on the floor or at an unknown elevation. In all, there were 21 reports of skull fractures to infants.