ATLANTA - Number of births in the U.S. fell in 2010, possibly due to the recession. One exception to this trend is the number of births among women aged 40s, who may feel unable to wait until the economy improves.Birth rate for women aged early 40s are surprisingly up 4% from the previous year, reaching its highest rate since 1967. While the birth rate for women in the late 40s also increased slightly.
But the birth rate for teenage mothers, and women in the 20s and 30s year, down.
"The women delaying birth until the end of the ages, above 40," said James Trussell, director of the Department of Population Research at Princeton University.
The experts do not know exactly why so many are delaying having children, though some suspect the economy becomes a big factor. However, "you reach a point where biological clock started ticking and the people realize that they have to do it," says Trussell, who was not involved in the research.
The new report of birth issued on Tuesday (17 / 5) by the Center for Disease Control and Prevention (CDC). The report was based on a review of more than 99% of birth certificates for 2008 - the first full year of recession. Overall, about 4.2 million babies born that year, down 2% from 2007. It was the first annual decline of birth rate since the start of this decade.
Experts say the most likely explanation is the recession and the decline in immigration to the United States, which has been widely blamed for the weak jobs market.
Some early birth information for the first six months of 2009 indicate a continuation decline of about 3% of total births.
Last summer, the agency gave the first footage from the 2008 figure. The new report confirmed the declining birth rate, and also provide details of births by age group.
The new report found that birth rates fell 3% for women in the early 20s, 2% for women in her late 20s, and 1% for those aged 30 for years.
Trends for these figures indicate that the older woman, the more reluctant they are to delay the birth, said lead author of the report, Brady Hamilton of the Center for Health Statistics CDC.
Teen birth rate declined by 2% - and the figures for Hispanic teens reported the lowest in two decades. Teen birth rate has declined since 1991 to 2005, but rose from 2005 to 2007. The new data indicate the increase was over.
However, the number of women in the 40s years of age who gave birth is still much less than women whose age was younger. The figure is about 10 births per 1,000 women in their early 40s years, and less than one per 1,000 for women in the late 40s.
Birth rate for women in their 20s end is 115 per 1,000, while for adolescents was 41 per 1,000.
Meanwhile, the Pew Research Center also released a report which found that some states with the largest decline in birth rates - such as Arizona, Florida, and California - were among those who fared worst with a variety of economic measures. The organization also pointed to a survey in 2009 which found that 14% of the people who are in golden years of pregnancy said that they were delaying having children because of the recession.
Experts say that the theory of delay may explain why the younger women have a lower birth rate in the CDC's findings, but may not explain the decline in teen birth rates. It also does not explain why the birth rate for older women rose so sharply.
Some speculate that the services of more sophisticated assisted reproduction may have resulted for couples who are older, or maybe some divorced women who choose to have additional children with his new partner.
New CDC report also shows that the percentage of babies born prematurely fell slightly, from 12.7% to 12.3%, a development hailed by some advocates of birth.
From 1990 to 2006, the U.S. witnessed an increase of 20% of the preterm birth rate - a trend that is worrying because it is more fragile preterm infants. The experts believe that premature birth is the main reason the U.S. infant mortality rate is higher than most European countries.
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