Premature birth is the leading killer of newborns in the United States.To raise money to support programs in the community that help moms have healthy, full-term pregnancies, the March of Dimes held its annual March for Babies walk Saturday in McMinnville. The one-mile walk began at Riverfront Park and was held along the greenway.More than 500,000 babies are born too soon each year, according to the March of Dimes.Elliott Witt Curtis was this year’s local March of Dimes ambassador. Elliott was born Aug. 30, 2013 at 32 weeks by emergency C-section due to complications caused by preeclampsia.