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Use of donor eggs in pregnancies rising

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CHICAGO — US women are increasingly using donated eggs to get pregnant, with often good results, although the ideal outcome — a single baby born on time at a healthy weight — is still uncommon, a study found.

That ideal result occurred in about 1 out of 4 donor egg pregnancies in 2010, up from 19 percent a decade earlier, the study found.

Almost 56 percent resulted in a live birth in 2010, and though most of these were generally healthy babies, 37 percent were twins and many were born prematurely, at low birth weights. Less than 1 percent were triplets. Low birth weights are less than about 5½ pounds and babies born that small are at risk for complications including breathing problems, jaundice, feeding difficulties, and eye problems.

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