NEW YORK — Laura Bennett isn't bound by convention. Professionally, at age 42, she's pursuing a midcareer switch into big-time fashion design. At home, she's a mother of five — with No. 6 due next month. "It was nothing that we planned ahead of time," Bennett says. "It's more that we were enjoying all the kids. "We have a happy home. Why not have as many children as we can?" It's barely a blip on the nation's demographic radar — 11 percent of U.S. births in 2004 were to women who already had three children, up from 10 percent in...
