After living much of our pre-parenthood lives as relative equals, it comes as a surprise when, post-baby, men and women start to assume different and not always complementary roles. Our instincts nudge women into the role of nurturers and men into the role of providers. When we become parents our most basic instincts rise to the surface. We find ourselves back in the prehistoric suburbs, where women wonder if baby might be allergic to mammoth and if there are enough wild berries in his diet, and where men stalk buffalo and question whether their hunting abilities will be good enough to get the family through the winter. It's like our brains get completely rewired, running two separate "his and her" programs, but for good reason. Both programs are equally important for the survival and well-being of the baby. She focuses on the micro, the day-to-day development of the baby, while he focuses on the macro, providing food and shelter for the baby. In simple terms, she has The Mommy Chip, while he has Provider Panic.