He says that one possible reason for the increase is stress hormones that may trigger childbirth. Thomas was stressed to the max during her first pregnancy, but can't be sure of the role it played. After two more full-term babies, Thomas had her fourth child, Nathan, too early. The March of Dimes is funding several studies to see if theories about stress hormones can be proven. In the meantime, women can reduce their risk by getting good prenatal care, limiting exposure to smoke and managing their stress.
Premature births are at least twice as common with black mothers than with white ones.
American moms with higher levels of income and education actually are at higher risk. Some researchers think that prejudice and racism may increase the stress levels of minority mothers. Copyright 2001 by Channel 6000 . All rights reserved. This material may not be published, broadcast, rewritten or redistributed.