Hilary Duff, new mother to 22-month-old son Luca, is volunteering her time to help the March of Dimes raise funds to help give more babies a healthy start in life. ”As a mom, I’m proud to support the March of Dimes helping more women have full term pregnancies and healthy babies. That’s why I walk in March for Babies,” she says in a new public service advertisement. “The money we raise funds research and local programs that help babies overcome…