http://www.fda.gov/fdac/features/2005/505_choking.html
U.S. Food and Drug Administration
Food or small objects can cause choking when they get caught in the throat and block the airway, preventing oxygen from getting to the lungs and the brain. Every child is at risk for choking, says the CDC. Younger children are particularly at risk because of their tendency to place objects in their mouths, poor chewing ability, and narrow airways compared with those of older children and adults. This article provides parents with steps to prevent children from choking.