A long-term study examining the health of children in the U.S. is being launched this month, following children from before birth until the age of 21. A team from UC San Diego and San Diego State University has started recruiting 1,000 pregnant women, or those who expect to become pregnant, to participate in the study. Eventually, about 100,000 children from 105 counties across the country are expected to participate in the National Children's Study, making it the most comprehensive ever conducted in the U.S. into the factors that influence children's health and development. Story