Once a month, she takes her two young children to McDonald’s for inexpensive breakfasts or ice cream. The fact that young mothers like Wood are teaching their children not to tell their dads that they’ve been to McDonald’s may underscore how hard it may be for the world’s largest restaurant chain to remake its image and revive U.S. sales. To lure back consumers, McDonald’s Corp’s (MCD.N) new Chief Executive Steve Easterbrook recently pledged to eliminate chickens fed human antibiotics at its U.S. restaurants.