An improved hand operated resuscitator is provided. In place of a squeeze bag for pumping air or oxygen into the face mask, this resuscitator has a bellows for the hand pumping of air or oxygen. In one embodiment the resuscitator is provided with a limiting mechanism that prevents the full expansion of the bellows so that the amount of air or oxygen delivered to the patient can be limited. This limiting mechanism can be a strap with a fastener that encircles the bellows of the resuscitator. It may be adjusted to provide the optimal amount of air of oxygen to the patient. Another embodiment has a stop mechanism that that prevents the full compression of the bellows. This stop mechanism may be a lever and a physical stop.
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