New CDC birth data confirms that the U.S. birthrate dropped 1 percent to reach an all-time low in 2011, extending the downward trend begun with the recession in 2008. Put down your knee-jerk fears about smaller population. This drop is a good sign, foretelling not a diminished but a strengthened workforce down the line.

Historic lows make headlines, but the deep story here is the time-lag ripple effect of delay that this year’s data demonstrate. The big birthrate declines we’ve seen since the recent high in 2007 (-9 percent overall) have been sharpest among teens 15-19 (a 25-percent drop over the four years) and to young women 20-24 (down 19 percent). Both of those age bands hit historic lows in 2011. We’re talking framework change here.

On the other hand, rates among women 25-29 have fallen a much smaller 9 percent since 2007. Rates among women 30-34 fell 4 prcent between 2007 and 2010 and held steady in 2011. Rates to women 35-39 also fell 4 percent between 2007 and 2010, but rose 3 percent in 2011. Rates to women 40-44 never fell: they’d been rising steadily since 1981, and rose another 7 percent between 2007 and 2011.

What we’re seeing here looks not so much like a big decline in the number of women who have kids over their lifetimes, or even necessarily in the number of kids they have, as like the time-lag effect of postponement. The big switch in the timing of when women have children was underway long before the recession of 2007 (CCF fact sheet), but the recession intensified it. We can see that in the rising birthrates for women 30-44, and the falling rates for women 15-29.

Already some women who stayed on the maternity sidelines in their 30s in the early part of this decline have jumped back into the game (visible in the rises among women 35 and older). Though the increases to date are not yet sizable , the scene is set for a flood of later mothers down the line. The overall rate of decline was lower than in the three previous years, and an overall upturn may be on the way in the next year or so. But though the recession officially ended in 2009, younger women’s rates are still dropping drastically in 2011 (down 8 percent from 2010). These indicators confirm that the recovery still needs to gain traction before people trust it with their families. They also tell us that the national birth timing dynamic is changing fast.

In their 25 percent rate plunge in just four years, young women today are enacting a sped-up version of the trend to delaying kids that’s been growing since the introduction of hormonal birth control, in 1960. Like millions of women before them, these citizens are refraining from having a first child early on (first births were also at an all time low in 2011), or sometimes a second, and choosing instead to invest in their educations (high school completion and college entry levels are up since 2007) and to build up their credentials at work. They may not be changing the number of kids they’ll have overall by much, but they are changing the economic circumstances into which those kids will arrive, for the better. Not all recession effects are problematic.

This sped-up delay effect has at least three overlapping causes. Most obvious is the recession/slow recovery (recessions are historically powerful contraception — before the Pill, the lowest recorded birth rate occurred in 1936). If people don’t feel they can afford kids, they become more vigilant about controlling fertility. A second cause lies in recent improvements in birth control methods and access, which make it easier to be vigilant.

A third springs from the fact that not only did young women refrain from having kids for the downturn; because they didn’t have kids, quite a few of them were able to complete high school and enroll in college. That put them on track for perhaps a decade of further delay (the time required to finish the Bachelor’s degree and maybe grad school, and then to establish at work) rather than just a year or two (on average college graduate women of all races have their first child at 30).

Benefits to Delay
When women control their own fertility, the world does change, with big gains for women, their families and society. College-educated women gain on average 12 percent in long-term annual earnings for every year they delay kids. So a woman who has a first child at 30 earns roughly twice as much for the rest of her career as she would have if she’d had her first child right after graduation, at 22, and so on up with each year of delay. Without benefit of economic experts, steadily growing numbers of women have figured out through deduction and observation that delay makes a lot of bottom-line sense to families.

Delay also serves women as a shadow benefits system in our family-unfriendly work world, making it possible to climb the ranks at work before kids, and then to use your established clout to negotiate your own deal when the kids do arrive. Delay also makes possible the trickle up of women into policy-making roles in business and government. Only when female citizens control their own fertility do they achieve critical mass and win a voice in the way society is structured. The combination of the ongoing intentional trend to delay and the recession-born delay effect will speed up that trickle up, leading to positive outcomes for kids, parents and women overall.

The 2011 birth data tells us young women are not interested in that road back to the old ways. They want good lives for themselves and their families, and they are working to realize that hope by putting babies on hold.

(All data from CDC Birth Data Reports for 2007-2011.)

Elizabeth Gregory is the author of ‘Ready: Why Women Are Embracing the New Later Motherhood’ (Basic Books). She blogs at www.domesticproduct.net.