US births continued to fall last year, leading to the fewest number of newborns in 35 years.
- Birth rates fell last year for nearly all age groups up to 34 years old, but rose for women in their early 40s.
- The birth rate for 15– to 19-year-olds dropped 5 percent from 2019. It's fallen almost every year since 1991.
- The cesarean delivery rate dropped to under 32 percent.
- The percentage of infants born at less than 37 weeks of gestation inched up for the fifth year in a row, to more than 10 percent.