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Background Guidelines recommend avoidance of excessive oxygen administration during neonatal resuscitation. Blenders are used in some but not all hospitals. It has been suggested that self-infl ating bags without a reservoir deliver around 40 % oxygen and could be used to provide an inexpensive and effective technique of avoiding oxygen toxicity. Objective To explore how much oxygen is delivered when using two different brands of neonatal self-infl ating resuscitation bags without a reservoir. Methods In a benchtop setting, the smallest non-disposable self-infl ating bags from the Laerdal and Ambu ranges were tested. Oxygen concentration delivered by these devices under a variety of conditions wa