01/09/2015 11:07 am ET Updated Jan 09, 2015

What Happens To A Woman's Brain When She Becomes A Mother

Ariel Skelley via Getty Images

The artist Sarah Walker once told me that becoming a mother is like discovering the existence of a strange new room in the house where you already live. I always liked Walker's description because it's more precise than the shorthand most people use for life with a newborn: Everything changes.

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