For many women in their 20's and 30's, the greatest professional hurdle they'll need to overcome has little to do with their work life. The most focused, confident, and ambitious women can find themselves derailed by a tiny little thing: a new baby. While more workplaces are espousing family-friendly cultures, women are still subject to a "parenting penalty" and high-profile conflicts between parenting and the workplace are all over the news: from the controversy over companies covering the costs of egg-freezing to the debate over parental leave and childcare inspired by Marissa Mayer's...