Studies are showing a trend of girls developing breasts and going through puberty earlier than they did in years past. Now researchers are investigating the role environmental exposures may play in this trend and the potential long-term health effects of earlier development. In this podcast, host Ashley Ahearn discusses with researcher Suzanne Fenton how research on environmental exposures and mammary gland development in rodents might be used to assess risks for humans. Visit the podcast webpage to download a full transcript of this podcast.