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放一個胚胎有什麼好處8 One Embryo as Good as Two in Second IVF Attempt Related News from HealthDay •Laying Still Raises Artificial Insemination Success •Health Tip: Exercise During Pregnancy •Stem Cells Coaxed to Make Precursors to Egg, Sperm •One Embryo as Good as Two in Second IVF Attempt •1 Million More Doses of Swine Flu Vaccine on Hand •Cocaine Use in Pregnancy Linked to Impulsivity in Sons Health News Archives WEDNESDAY, Oct. 28 (HealthDay News) — Women undergoing a second round of in-vitro fertilization should get one embryo instead of two, suggests new Swedish research that found the first approach is almost as successful as the second and greatly reduces the risk of multiple births. A previous study produced the same result, but this latest report examined the women for a longer period of time, through more embryo implantations. The findings “should provide comfort for those who want to perform single-embryo transfers that the pregnancy rates are equivalent,” said Dr. William E. Gibbons, president of the American Society for Reproductive Medicine and a professor at Baylor College of Medicine in Houston. Gibbons said debate over the number of embryos to implant began about a decade ago, when in-vitro fertilization (IVF) began to be more successful. “Since only a fraction of eggs released by a woman are capable of producing a baby, the pregnancy rate is higher when more than one embryo is put back in,” he said. “However, in the late ’90s the standard number of …