The deepest change begins with men raising children as much as women do and women being equal actors in the world outside the home. There are many ways of supporting that, from something as simple as paid sick leave and flexible work hours to attributing an economic value to all caregiving and making that amount tax deductible.
Mama grizzlies mate later than other bears. They have two cubs instead of four. They wait four years - about twice as long as other bears - between having cubs. And after they're pregnant, if winter is hard or their health is not good or the food supply is uncertain, they re-absorb the embryo into their body.