The most appropriate circuit for ventilating a spontaneously breathing infant -
Ayre&;s T piece is used in infants. The patient inspires fresh gas from the reservoir tube,expires into the reservoir tube. Advantages are they are inexpensive,compact,no valves and low dead space
Jackson Rees modification of Ayre's T piece
Mapleson A or Magill's circuit
Mapleson C or water's to & fro canister
Bain's circuit
Anaesthetic equipments