noun (n)

• an enclosing framework on casters or wheels; helps babies learn to walk(noun.artifact)

  Synonym:
  baby-walker, walker
  

  source: wordnet30
• wheeled vehicle that can be pushed by a person; may have one or two or four wheels(noun.artifact)

  Synonym:
  cart, handcart, pushcart
  

  source: wordnet30
• a small vehicle with four wheels in which a baby or child is pushed around(noun.artifact)

  Synonym:
  baby buggy, baby carriage, carriage, perambulator, pram, pushchair, pusher, stroller
  

  source: wordnet30