Lots of people start noticing babies once they have one, but in the United States they are literally everywhere. Fertility here is on an upswing, or so says a USA Today article that explained it sets America apart from other industrial nations that are dealing with low birthrates. It said:

"The fertility rate hit 2.1 in 2006, according to preliminary estimates released by the National Center for Health Statistics. It's a milestone: the first time since shortly after the baby boom ended that the nation has reached the rate of births needed for a generation to replace itself, an average 2.1 per woman."

The report also says that while some countries like Asia and Europe have launched incentives like monetary bonuses, government assisted childcare and family leaves to encourage citizens to reproduce the U.S. has not. And, it states that birth rates of affluent couples have contributed considerably to the numbers.
Source