Parents can feel desperate when their little ones bite, taking it as a sign of a badly behaved child or left scrambling if their kid gets kicked out of a child care for recurrent biting. But it’s ...

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 ...