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Study Shows Improved Outlook for Triplets

WebMD Health News

Sept. 20, 2000 -- The number of women giving birth to more than one baby at a time has risen by more than 100% in the last 20 years. Although big births like those of the Dilley sextuplets and the McCaughey septuplets make headlines, most multiple births are triplets or twins.

Often, women who conceive three or more babies at once through fertility treatments are advised to undergo a "selective reduction" -- a procedure in which doctors inject a toxic substance into one or more of the fetuses early in the pregnancy. This reduces the number of babies, with the hope of giving the remaining fetus or fetuses a better chance of survival and good health, but it can also raise medical, ethical, and psychological issues for both parents and physicians.

But as technology has improved and doctors have gained more experience working with multiple pregnancies, survival rates for triplets appear to be good enough that many couples who want to keep all three can be safely counseled to do so.

In a new study published in The American Journal of Obstetrics and Gynecology, researchers evaluated 127 triplet pregnancies. Of those, 46 chose to have the reduction procedure (95% of whom chose twins and 5% of whom chose to carry just one baby). Eleven of the women lost one or two babies spontaneously after nine weeks without undergoing the procedure.

The study showed that triplets had the same survival rates as the babies of mothers who selectively reduced, and were delivered about the same time. Although the triplets were smaller, on average, than the other babies, their weights were not so low as to cause them to be kept in the hospital significantly longer. The length of the pregnancies averaged 32 weeks for the triplets and 33 weeks for the group reduced to twins; a full-term pregnancy is 38-42 weeks after the last menstrual period.

The study shows that there have been substantial improvements in the outcome of triplets, says study author Mark P. Leondires, MD.

"Most patients I see just want to have a baby, and they want to know if they are going to have a baby at about the same rate if they go ahead with triplets or not," says Leondires, of the Walter Reed Army Medical Center in Washington. "What the study says is, whether they have a reduction or go on with triplets, you can't say there is a significant difference in the take-home baby rate for one, two, or three [babies]."

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