Abstract: An intermittent positive pressure breathing device for neonatal infants. The device is connected to a supply of pressurized oxygen supplied through a first conduit. The first conduit terminates in a venturi nozzle by which ambient air is entrained so that a mixture of oxygen and ambient air at a desired concentration is delivered along a second conduit towards the mouth of the neonate. The second conduit terminates in a mask having a first aperture disposed adjacent the mouth of the neonate in a sealing relationship and a second aperture which is repeatedly and rhythmically covered by the operator to initiate a conventional breathing pattern for the neonate. A one way valve upstream of the venturi nozzle opens when the venturi nozzle induces a lower than atmospheric pressure in the device and automatically closes when the pressure in the device is increased by the operator closing off the second aperture.