This document summarizes key facts about progress towards Millennium Development Goal 4 (MDG 4), which aims to reduce child mortality. It finds that while the global under-five mortality rate has declined 41% since 1990, the pace of reduction must accelerate to meet MDG 4. Most of the 6.9 million child deaths in 2011 were from preventable diseases. Sub-Saharan Africa and Southern Asia still have the highest rates and account for an increasing share of global child deaths. Redoubling efforts there is critical to achieve universal reductions.