In Why I’m Like This Rumbling Volcano (And Why You Should Be, Too), I stressed the importance of remaining firm about the expectations you have of your children when it comes to their language development. At the same time—and I just learned this lesson sharply—it’s vital to remember that there’s a fine line between being firm and being rigid. Being firm is productive, but being too firm crosses the line into being rigid, and that’s counterproductive ground. The challenge lies