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This systematic review reports the results of 117 observational studies (cohort, cross-sectional and case-control studies) that examined the association between breastfeeding and childhood asthma in the general population (1). A meta-analysis of the results found that breastfeeding, regardless of exclusivity or duration, was associated with a reduced risk of childhood asthma: 22% reduced odds of a child ever having asthma and a 24% reduced odds of a child having asthma in the last...