My son Brayden is 14 months old and has SWCAH. He had his first flu shot a month ago, and I neither doubled or tripled his med’s.  However, he did get seem to feel bad for almost a week after getting the shot and had cold like symptoms.  He will have to get his second flu shot very soon. Since he has an appointment with his endo tomorrow, I plan on asking him whether its necessary to increase his Cortef when he gets the shot.