How does the number and spacing of births affect a women's risk for breast cancer?

Updated: Dec 26, 2019
  • Author: Graham A Colditz, MD, DrPH; Chief Editor: Chandandeep Nagi, MD  more...
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A higher number of births is consistently related to lower risk of breast cancer; each additional birth beyond the first reduces long-term risk of breast cancer. In addition to a protective effect of higher parity, more closely spaced births are associated with a lower lifetime risk of breast cancer. [19]

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