Video: Babies at risk

One in 10 Hamilton County infants is born below what is considered a healthy birth weight, according to state health statistics. In some parts of Chattanoga, however, the odds are one in four, a rate that makes the city among the worst in the United States for underweight births. Local researchers believe the statistic has to be about more than socioeconomics and gaps in prenatal health care. They are investigating whether pollution here could be at least partly to blame.