Of the thousands of research studies in the U.S. recruiting women right now, just a few dozen specifically include pregnant women. And while the other trials technically could enroll pregnant women — after meeting certain requirements — they often don’t. “It’s absolutely possible to do studies in pregnant women,” Dr. Catherine Spong, an obstetrician who is leading the National Institute of Child Health and Human Development task force. The task force will present its recommendations to the federal health department next year.