Toddlers need consistent care from a pediatrician to make sure, among other things, that they are hitting developmental milestones and their vaccinations are up-to-date.
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Doctors are trying to slowly wean Lexi from her dependence on methadone. She's just 2 weeks old. Under a doctor's advice, her mom took methadone while pregnant, to help kick a heroin habit.
Kristin Espeland Gourlay/RIPR
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.
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
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
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
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.
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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