When Should I Worry About Temper Tantrums?

Dr. Gabrielle Carlson of Stony Brook University tells the Child Mind Institute that, like any troubling behavior, parents should worry about extreme outbursts when they meet her "3 Ps" criteria: persistent, pervasive, and impairing. Yes, Dr. Carlson admits, "impairing" doesn't start with a P, but it's important.