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Does childbirth increase your chance of breast cancer? Yes. But it also decreases it in the longterm …depending on how old you are your first time around. It has to do with your hormones like estrogen and the damaged DNA in your cells.

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Sources: https://docs.google.com/document/u/1/d/12zVuQ4M_lAIOgdmuzfL3Vazc_zjg5UuOZBi6VfPcYPc/pub