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[A] The following conclusions are supported by good evidence:
Observational data comparing women with a history of breastfeeding (ever having breastfed) to those never having breastfed identified an association of breastfeeding with reduced risk of maternal breast cancer.
Cohort and case-control studies provide consistent evidence that lactation protects against premenopausal and postmenopausal breast cancer. It is recommended that mothers aim to exclusively breastfeed their infants for about