Toddlers can learn how to go like a big kid with their good pal, the No.1 Blue Engine, with the Thomas & Friends 3-in-1 Potty from Fisher-Price. This convertible training toilet starts as a potty chair, which rewards every success with fun music and sounds. When they're ready, the removable potty ring helps your child transition to the big toilet. The potty chair converts to a sturdy step stool to give your little train lover a boost to the toilet or the bathroom sink.