By the time Mara Chen’s son turned three, mornings had become a gauntlet. A request to put on shoes could trigger a full-body meltdown: screaming, kicking, fists swinging at her face. “I started ...

There's nothing more unpleasant than witnessing a toddler's temper tantrum, except, maybe being the parent desperately trying to calm their child. But what's actually happening in that little one's ...