My 4 month old has been screaming his head off for 40 solid minutes, I've never seen him like this, what could be wrong? He won't feed but can't have been that hungry when he started, as he'd'had a feed a little while before, he's'had a nappy change, I've checked his clothing isn't hurting him. We're holding and rocking and soothing him but he is furious - I think he just hates the train. Any suggestions? I'm in tears myself here. Not really an AIBU but am desperate for answers!