In theory, improving low-income families' housing and neighborhoods could also improve their children's health, through any number of mechanisms. For example, less exposure to environmental toxins could prevent diseases such as asthma; a safer, less violent neighborhood could improve health by reducing the chances of injury and death, and by…

The past century has seen vast improvements in our children's health. The infectious diseases that once killed huge numbers of children have largely been conquered. Infant mortality has also fallen markedly, although the United States lags behind other industrialized nations in this and other measures of children's health. Accidents and injuries…