My firstborn is 3 and a half months old and over the past couple of days he has been having outbursts of hysterical crying on and off all day, to the point where he turns bright red and boiling hot and makes himself cough. He gets into such a state! It’s like he goes from 0 to 100 in a matter of seconds and nothing will console him. I don’t think he’s in pain- is this just a phase? Is it normal?