A look at the charts tells a different story IMO.
> Birthrates fell or held steady for women of all ages except those in their early 40s. Teenagers saw the sharpest drop, with a 5% decline in their birthrate. Since peaking in 1991, the teen birthrate has fallen 73%.
Seems to me like people are waiting longer these days. We may be in a lull at the moment, but I'd expect this to pick back up barring any adverse economic conditions.