Consider the most recent statistics available from the National Center for Health Statistics, part of the Centers for Disease Control and Prevention (CDC):
In 2007, 4,317,119 babies were born in the US.
The mean age for women having their first baby in 2007 is 25 years, compared with 25.2 in 2003.
Birth rates for women 35 to 39 (47.5 births per 1,000 women) and 40 to 44 (9.5 births per 1,000 women) were the highest in four decades.
The birth rate for teenagers ages 15 to 19 years increased 5 percent since 2005. The current rate for this age group is 42.5 per 1,000 births.
In 2006, the twin birth rate was 32.5 twin births per 1,000 women.
The preterm birth rate (less than 37 weeks in the womb) was 12.7 percent in 2007.
Cesarean deliveries accounted for 31.8 percent of all births in 2007, an increase of over 50 percent in the past decade.
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