a baby walker is a device that can be used by infants who cannot walk on their own to move from one place to another. modern baby walkers are also for toddlers. the have a base made of hard plastic sitting on top of wheels and a suspended fabric seat with two leg holes. in the us, baby walkers are responsible for about 2000 injuries annually to children serious enough to require a trip to the emergency room, prompting calls from pediatricians for their outright ban.