Pew Research Center, we learn that the birth rate is pretty closely correlated with the economy. I hadn't ever thought about this and found it very intriguing (they have a lot of awesome charts and graphs, so go check it out...after you finish here).
The study only has data through 2008, but I am sure there was another decrease in 2009, due to the recession. Also, does it surprise you that in 2001 there was also a drop? I read somewhere that there is even a link between birth rates and natural or man made disasters. It seems that, not only did the events of 9/11 kill thousands of people, it may have prevented many more thousands from being born! (no, I can't back that up, but its something to think about).
Another question I have about the US birth rate trend is this....If there was a huge baby boom in and around the '50s, shouldn't we have seen another moderate boom around the '70s? Why didn't the boomers have many kids?
It looks like after we have Baby #2 we will be just about the average American family. Now, just have to figure out how to have 1/4 of a child.....