• Rates dropped for Hispanic women, 2 percent, and blacks, 1 percent, but less than the previous year. The rate continued to stay the same for whites, rose 4 percent for Asian-American and Pacific Islanders, and fell slightly for American Indians and Alaska Natives.
• Rates fell again for women in their early 20s, down 3 percent from 2011. That’s the lowest mark for women in that age group since 1940, when comprehensive national birth records were first compiled.
• For women in their late 20s, birth rates fell 1 percent. That age group accounts for more than a quarter of all of the nation’s births. The rate rose a slight 1 percent for women in their early 30s, who have nearly as many babies as women in their late 20s.
• Rates also rose 2 percent for moms ages 35 and older, and 1 percent for women in their early 40s. Rates in older moms have been rising slightly in recent years, despite the overall downward trend. Experts say that’s because older women generally have better jobs or financial security, and are more sensitive to the ticking away of their biological clocks.
• Birth rates for teen moms have been falling since 1991 and hit yet another historic low. The number of babies born to teens last year — about 305,000 — is less than half the peak of nearly 645,000 in 1970.
The teen birth rate has been cut in half since 1991, said Bill Albert of the National Campaign to Prevent Teen and Unplanned Pregnancy, who called it a “stunning turnaround.”
Experts attribute that decline to a range of factors, including less sex and more use of contraception.
Another report highlight: About 33 percent of births last year were delivered through Cesarean section — a rate unchanged from the previous two years.
C-sections are sometimes medically necessary. But health officials believe many are done out of convenience or unwarranted caution, and in the 1980s set a goal of keeping the national rate at 15 percent.
The C-section rate had been rising steadily since 1996, until it dropped slightly in 2010.
Even if the C-section rate has peaked, it’s still too high — particularly in certain states, Emory’s Hogue said. For example, last year 40 percent of births were C-sections in Louisiana, and more than 38 percent in New Jersey, Mississippi and Florida, the report found.
“There’s a lot of room for improvement,” she said.