We’ve all heard of the “terrible twos.” But what’s really going on when a toddler has a tantrum? And what’s “normal”? This week, we're teaming up with Boston Children's Hospital to answer your biggest questions about parenting and your kids' health. Starting with those spectacular meltdowns. We've tapped psychologist Dr. Erica Lee to help us understand why kids tantrum, how to help your own toddler when they do, and (crucially) how to stay sane through all of it.