Caden is a screamer aswell

It started at about 3 months old and has got worse as he gets older, he had a MAJOR screaming fit in the car today and it hurts our ears so badly. He does it when he is tired or grumpy. I give him his dummy and try to calm him down, thats the thing Ive found works best...then I ignore him, so he knows that Im not going to put up with that.