This essay has investigated how ”nudging” could be used as a complementary policy tool, rather than as a substitute to regulations and enforcement, particularly in the Swedish parental leave system. This essay argues that the most effective nudging tool to us in order to make fathers take out more parental leave days is by using the power of social norms. Nudging has been criticized for being a manipulative tool that tries to control people's unconscious actions as well as simple marketing knowledge. The study shows that nudging should not be applied in policy design in order to change attitudes. Yet, nudging can change behaviors and behaviors can change attitudes. Nudging promotes an empirical approach in policy making, in contrast to traditional policy tools. Individuals are generally more accepting towards nudging policys if the nudge is aimed to help them make better choices, rather than nudging aimed to improving the society as a whole.