Physicians say roughly half of all preterm births are preventable, caused by social, economic and environmental factors, as well as inadequate access to prenatal health care. ER Productions Limited/Getty Images hide caption
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Roughly 1 in 10 infants were born prematurely in the U.S. in 2018, according to the Centers for Disease Control and Prevention. The drug Makena is widely prescribed to women at high risk of going into labor early, though the latest research suggests the medicine doesn't work. Luis Davilla/Getty Images hide caption