Jung Ha-yoon, 2, and other children in Seoul, South Korea, enjoy playing around (and in) ceramic jars. The country's infant mortality rate dropped 91 percent between 1972 and 2012. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

A nurse attaches the low-cost breathing machine (far left) to an infant at The Queen Elizabeth Central Hospital in Blantyre, Malawi. Jocelyn Brown/Rice University hide caption

itoggle caption Jocelyn Brown/Rice University

Neonatal nurse Florence Mwenifumbo monitors a newborn receiving bubble CPAP treatment in Blantyre, Malawi. The device was developed by students at Rice University in Houston. Rice 360/Rice University hide caption

itoggle caption Rice 360/Rice University

Researchers stroked babies' faces with a paintbrush while they watched the same thing happening to a baby in a video. How long the babies in the experiment watched the screen gave clues to what they were thinking. Courtesy of Maria Laura Filippetti hide caption

itoggle caption Courtesy of Maria Laura Filippetti

A lab technician at the Mothers' Milk Bank Northeast in Newton Upper Falls, Mass., prepares donated breast milk for pasteurization in August 2012. The process kills harmful bacteria. Elise Amendola/Associated Press hide caption

itoggle caption Elise Amendola/Associated Press

Sure, it's cute. But that voice! Lennart Tange/flickr hide caption

itoggle caption Lennart Tange/flickr

A health worker weighs a Somali baby on scales at a medical clinic in Mogadishu. Babies in Somalia have the highest risk of dying within the first 24 hours after birth. Carl de Souza/AFP/Getty Images hide caption

itoggle caption Carl de Souza/AFP/Getty Images

By taking antiretroviral drugs during pregnancy, this Tanzanian mother lowered the risk of passing HIV to her daughter. Siegfried Modola/AFP/Getty Images hide caption

itoggle caption Siegfried Modola/AFP/Getty Images

Madeline Mann seen shortly after she was born prematurely in in 1989. Weighing 9.9 ounces at birth, she is now an honors student in psychology at Augustana College in Rock Island, Ill. A. Hayashi, Loyola University Medical Center/AP hide caption

itoggle caption A. Hayashi, Loyola University Medical Center/AP