A baby born too soon continues to develop and grow inside an incubator at the neonatal ward of the Centre Hospitalier de Lens in Lens, northern France. Philippe Huguen/AFP/Getty Images hide caption

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What should parents be told before their premature infants participate in a clinical study? iStockphoto.com hide caption

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How much oxygen should severely premature infants receive? A study that sought to answer the question has been criticized for not fully informing parents about the risks to their children. iStockphoto.com hide caption

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Madeline Mann seen shortly after she was born prematurely in in 1989. Weighing 9.9 ounces at birth, she is now an honors student in psychology at Augustana College in Rock Island, Ill. A. Hayashi, Loyola University Medical Center/AP hide caption

itoggle caption A. Hayashi, Loyola University Medical Center/AP