<prompt> The most appropriate circuit for ventilating a spontaneously breathing infant during anaesthesia is:Jackson Rees modification of Ayres T PieceMapleson A or Magills circuitMapleson C or Waters to and fro canisterBains circuit  <response>: The most appropriate circuit advocated for use in infants is the Ayres T piece Mapleson E. Ref: Lees Synopsis of Anaesthesia, 12th Edition, Page 117; Sho Textbook of Anaesthesia By Ajay Yadav, 2nd Edition, Page 27 