The most effective way to get your child to cooperate is to give her two choices -- both of which you'll be happy with. When you say, "Do you want to wear your blue jacket or the green sweatshirt with the hood?" it'll be a win-win situation: You give your child a sense of control, and he'll be ready to go out one way or the other. Don't offer a toddler or preschooler an open-ended array of options ("What do you want to wear today?") because the decision will be too overwhelming. "Of course, you can't always give your child choices because you would never get out of the house on time," says Dr. Kazdin. "But do it whenever you can."