The deaths of children under age five fell by 50 percent to below six million in 2015, the first time that has happened; in 1990, there were 12.7 million under-five deaths. In the same period, there have been major gains in reducing child malnutrition and improving maternal health. Those successes are a reminder that simple, affordable solutions are within reach, and that vigorous commitment can transform lives. But 16,000 children under five still die every day, so there is much more to do. What has it taken to achieve the wins in child mortality? Where do we go from here?