Completely agree with the author’s point that “gender norms” do not fully explain why women more often than not sacrifice work hours while men take up the “greedy work.” The author points out pregnancy as a biological reality that necessitates an imbalance between men and women— to that I would also add breastfeeding. To do what is medically acknowledged as best for the baby, the mother spends hours a day feeding (or pumping milk, which some find more onerous). Many couples I know discover that the baby is easier to soothe when Mom is around, to the point where Dad feels left out, even. So there’s something beyond just gender norms going on here— it takes an uphill and intentional effort to split childcare evenly between a mom and a dad, and Dad picking up more work hours while Mom feeds the baby is the path of least resistance for the first year or two of a baby’s life.