Placebo-Controlled Trial of Blowing on a Wound: Pediatric Antimicrobial Efficacy of Parental Saliva-Adjacent Airflow

Background. Blowing on a minor wound ('kissing it better') is among the most widely practiced pediatric interventions, yet remains unapproved. We conducted the first placebo-controlled trial.

Methods. Children (n = 312, ages 3–7) with grazed knees were randomized to (a) parental airflow plus 'there there,' or (b) clinically applied antiseptic. The primary endpoint was subjective healing within 5 seconds; airflow was delivered at the manufacturer-recommended distance of one concerned parent.

Results. Parental airflow achieved 99.8% subjective healing in 4 seconds, versus 3 minutes and considerable crying for antiseptic (p < 0.001). Mechanistic analysis found the effect was not antimicrobial but attributable to a parent crouching to eye level. No adverse events, except when a sibling was watching.

Conclusion. Blowing on a wound is non-inferior to antiseptic for the only outcome children care about. The active ingredient is attention. Antiseptic is still recommended for the actual wound.

Conflict of Interest. Both authors are parents and were unblinded by instinct.

Funding. Supported by the Center for Things Grandma Already Knew (Grant No. TOLD-YOU).

Ethics. Approved by the playground ethics committee. Consent obtained from each child via a sticker.

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