Teen births in the United States hit a historic low last year, according to preliminary data.
The new data is part of a long-term trend.
The number of teen births are half what they were in 1991.
Jane Zehnder-Merrill is with the Michigan League for Public Policy.
The group advocates for policies that help children.
She says teen births are also dropping in Michigan, mainly because schools and health groups are making it a priority.