Twin birth rates are increasing in U.S.


Twin Babies

According to the reports of Centers for Disease Control and Prevention (CDC) on Wednesday, twin births in U.S. have been increased by double the number that was three decades ago.

This major portion of the increase in twin birth rates has been attributed to fertility drugs and treatments such as the use of in-vitro fertilization (IVF). Third of the increase in the twin birth rate can be ascribed to women waiting for children for a long time.

“When people say it seems like you see more twins nowadays, they’re right,” said Joyce Martin, a CDC epidemiologist and coauthor of the new study. “The increases are quite widespread, affecting all age groups and all parts of the country.”

In the year 2009, more than 137000 twins were born in the U.S. and the same number accounted for one twin birth in 30 births. However, in the year 1980, 68339 twins born, when the ratio was one twin birth in 53 births.

Number and Rate of twin births in U.S. from 1980-2009

From the year 2000 to 2009, mother with the ages 30 and over represent 35% of birth cases while in 1980, it was 20%.

“You have a double whammy going on. There are more older moms and more widespread use of fertility-enhancing therapies,” Martin said.

In all the 50 states, number of twins per 1000 births rose and has been doubled in Connecticut, Hawaii, Massachusetts, New Jersey and Rhode Island.

“We seem to be making improvements, refinements to fertility-enhancing therapies, so that could then result in a lowering of the increase of the pace in twin and other multiple births,” Martin told Reuters.

Twin births are riskier than single births, she said.

“Infants born in twin deliveries are at greater risk of poor outcome,” she said. “They are born smaller, they are born earlier. They are more likely not to survive the first year. Most twins do fine, but they are at higher risk.”

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