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As more states outlaw abortion, some define human life as starting at fertilization. Some patients and health care workers worry that this could jeopardize in vitro fertilization treatments.
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Most fertility treatments have been put on hold following recommendations by the American Society for Reproductive Medicine, but some specialists and their patients argue they can't afford to wait.
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The twin birthrate nearly doubled between 1980 and 2014. Now it's going down among white mothers. What's behind the change?
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A small study of teens who were conceived via assisted reproductive technology finds a significant number already have hypertension and premature "age-related changes" in their blood vessels.
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Researchers disabled a gene that they think helps determine which human embryos will develop normally. The technique they used is controversial because it could be used to change babies' DNA.