A new report from the CDC National Center for Health Statistics shows the teen birth rate fell to a little more than 31 births per 1,000 young women aged 15 to 19 in 2011.

Twenty years ago, that rate was nearly 62 per 1,000 teenage girls.

Health officials say there are several reasons, including more talk about the responsibility of having a child and how difficult it is to be a teen mother.

And for the fifth straight year, both the preterm birth rate and rate for low birth-weight babies also declined.