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IVF treatment continues to be a popular choice for making babies. The treatment, known formally as in vitro fertilization, is successful in producing a live birth in 41.4% of treatment cycles for women under age 35, according to information released Monday by the Society for Assisted Reproductive Technology.

Data for 2009, the most recent year analyzed, showed the rate of live births per cycle with fresh embryos did not change much from 2008 when it was 41.3% for women under 35. However, that's still an improvement from 2003 when the rate of live births per cycle was 37.5% in that age group.

Success rates fall off quickly for older women, however. In 2009, the percentage of cycles with fresh embryos resulting in live births was 31.7% for women ages 35 to 37, 22.3% for women ages 38 to 40 and 12.6% for women ages 41 to 42.

The more embryos transferred, the higher the risk of multiple births. Several years ago, the Society for Assisted Reproductive Technology called on doctors and patients to limit embryo transfers to one in healthy...