Gro-Group Bumbo Toilet Trainer Seat Specification.. The New Toilet Trainer is another first in ultimate baby products! The Bumbo Toilet Trainer is the perfect gift as your toddler prepares to take that first step in becoming potty trained. Now your child can sit on the Bumbo Toiler Trainer with the same secure confidence, as when they sat in their original Bumbo. This allows for a smooth and easier transition in your child’s training, since they are already comfortable with its soft feel, color, and texture. Soft and ergonomically shaped to fit your baby's bottom. The Bumbo Toilet Trainer offers the support that gives your baby the confidence to want to use the toilet every time.