Hi Margaret. I also have a little boy, 4 1/2 months old, with SWCAH. Like you, we found out he had CAH when he was 10 days old. He is up to date on all of his vaccinations. With the last set, at 4 months, he ran a small fever and was a bit fussy, but it was nothing "major". His doctors have told me that the vaccinations are usually nothing to worry about. You just have to watch out for fever occasionally. His two month vaccinations didn’t bother him.
Congrats on your baby! I’m still a "newbie" when it comes to CAH, and this place has been a HUGE help!