Abstract: An infant inhaler in which the aerosol medication is communicated into a flexible bag. Using a mask, during inhalation, the medicated air within the flexible bag is drawn into the infant's lungs; exhalation from the infant is exhausted into the atmosphere. By watching the deflation of the flexible bag, the care-giver is appraised of the progress of the medication's inhalation. The entire assembly is held with one hand allowing the infant to be cradled in the other arm. Refilling of the flexible bag with ambient air is accomplished by inverting the apparatus which causes the valves therein to open and allow ambient air into the flexible bag. Refilling the flexible bag with medication is done using a single hand by pressing the aerosol bottle against the apparatus.