Safety Warnings: CHOKING HAZARD - ; A must-have for the parents of baby boys, the Weeblock Co-Pack Road Signs from Sozo has two wee-wee-absorbing sponges for use when changing diapers. Weeblock was invented by the parents of two boys who have developed a useful and fun solution to the inevitable "fountains of youth." Just cover the baby during changing with the Weeblock and stay dry! Weeblock is a machine washable sponge covered in soft cotton jersey.