Objectives\u2014This report presents provisional 2017 data on U.S. births. Births are shown by age and race and Hispanic origin of mother. Data on prenatal care, cesarean delivery, preterm births, and low birthweight are also presented. This report is the second in a new annual series replacing the preliminary report series.Methods\u2014Data are based on 99.93% of 2017 births. Records for the states with less than 100% of records received are weighted to independent control counts of all births received in state vital statistics offices in 2017. Comparisons are made with final 2016 data and earlier years.Results\u2014The provisional number of births for the United States in 2017 was 3,853,472, down 2% from 2016 and the lowest number in 30 y...