Pollution link with birth weight. bbcnews. April 8, 2009.Exposure to traffic pollution could affect the development of babies in the womb, US researchers have warned.They found the higher a mother’s level of exposure in early and late pregnancy, the more likely it was that the baby would not grow properly.The study, published in the Journal of Epidemiology and Community Health, looked at 336,000 babies born in New Jersey between 1999 and 2003. [ See ]