Breastfeeding is held up by doctors as the healthiest way for mothers to feed their babies. However, there are health issues, socioeconomic barriers and logistical challenges for moms around the country to do so. As this year's World Breastfeeding Week comes to a close, we present a full picture of what nursing in the U.S. looks like. From the demographics who have the highest breastfeeding rates to how long most mothers nurse their children, here are the facts -- and why it all matters.