My 21 month old granddaughter has some awful meltdown tantrums when things don't go her way. They are not your garden variety tantrums....they are awful! They seem worse when she is tired. They are terrible!! It's like she becomes obsessed and nothing we do seems to help. She throws things, bangs her head, kicks, trys to bite, screams and on and on. We've ignored her, talked calmly to her, talked sternly to her, put her in timeout (or tried to) etc., etc. It breaks my heart and is nerve racking when she acts like this. Her parents are at their wits end. How can we tell if she has a behavior problem that needs medical attention? Or do we just hope and pray she grows out of it??? Help!