Utah remains, by far, the state with the highest birthrate — which compares the number of births to the total population, regardless of age or sex. The general fertility rate — generally considered a more accurate measure — is the number of live births per 1,000 girls and women who are between 15 and 44 years old.
Utah women have long had more children than American women do on average. But in a shift that accelerated in 2008, the state's young women began having fewer children. The number of babies born to women ages 20 to 24 decreased more than 28 percent between 2007 and 2015.
The number of women in that age group having their first child decreased by more than 25 percent.
In 2015, the fertility rate in South Dakota increased to 78.2, just high enough to overtake Utah, which had a fertility rate of 78.0.
http://www.sltrib.com/home/5493953-155/ ... lay-having
The baby pipeline has been drying up. Significantly.