Breastfeeding lowers the risk of breast cancer, especially in premenopausal women [9,85-88].
A pooled analysis of data from 47 studies found that compared to mothers who never breastfed, :
Although data are limited, breastfeeding for less than 1 year may also lower breast cancer risk .
Breastfeeding may be especially good at lowering the risk of estrogen receptor-negative (including triple negative) breast cancers [87-92].
For a summary of research studies on breastfeeding and breast cancer, visit the Breast Cancer Research Studies section.
Learn about other healthy lifestyle behaviors that may lower breast cancer risk.