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Women who conceive after a year have a higher chance of giving birth prematurely

The reasons for premature birth are a mystery in nearly half of the cases, Some pre-term births are caused by maternal or fetal stress, infections, high blood pressure, //bleeding or stretching of the uterus. But in the rest, the reason is unknown , experts say fertility troubles could explain part of the problem.

Premature birth -- when the baby is delivered before 37 weeks of pregnancy -- is a major public health concern because underdeveloped babies are at an increased risk of death in the first year of life and are more likely to develop heart, lung and brain disorders if they survive. The rate of premature births in the United States has jumped in the last 20 years from about 9.4 percent of all births to almost 12 percent. About a half million premature infants are born annually in the United States.

Dr. Olga Basso of the University of Arhaus in Denmark and Dr. Donna Baird of the U.S. National Institute of Environmental Health Sciences analyzed nearly 56,000 singleton births in Denmark, where women had reported early in their pregnancies how long it took them to get pregnant. About 11 percent of the women had to try for more than a year to get pregnant -- the common definition of infertility -- and about half of them eventually turned to fertility treatment.

Among the women who had conceived their first baby within a year, 5.4 percent gave birth prematurely. That compared with 7.4 percent of the women who had trouble but eventually conceived naturally and 7.6 percent of women who had fertility treatment after at least a year of failing to get pregnant.

Once the results were adjusted for factors that influence pre-term birth, including age, women who had trouble getting pregnant were about 40 percent more likely to give birth prematurely than those who conceived easily, the study found.

Fertility treatment itself is often blamed for some premature births, but the study found pre-term births occurred about as often a mong women who eventually conceived naturally after trying for more than a year to get pregnant.

Most previous studies have compared women seeking fertility treatment with women who have no trouble conceiving. Few have compared fertility-treated women with women who have problems conceiving but eventually do so naturally.

"Maybe it's not really the fertility treatment that does this, but it's something associated with the causes of the infertility," said researchers.

The study also found an increased chance of having a low birth weight baby and needing a Caesarean section among women who had trouble getting pregnant, but those links became much weaker once the mothers' age, obesity and smoking habits were taken into account.

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