Last year we did a story on infant mortality in Rochester, NY. A few experts we talked to said  toxic stress was one possible reason that babies born to black and Latina mothers died at such a high rate.

But what is toxic stress?

Latino USA producer Daisy Rosario spoke to researchers and doctors to find out what it is, what it does, and why it might change the way we look at public health.

Photo by Nathan Congleton via Flickr.