A meta-analysis of 18 studies found that children who were breast-fed exclusively had a more than 70% reduced risk of sudden infant death syndrome and that those who received breast milk in combination with formula had a 60% lower risk compared with those who had never been breast-fed. However, researchers wrote in Pediatrics that the study does not indicate a causal relationship, noting that more investigation is needed to examine the impact of breast-feeding duration on the risk for SIDS.

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