I was a small baby and almost died before I was diagnosed. At birth it was difficult to tell if I was male or female. It took three weeks to discover what was wrong and confirm that I was a girl using blood tests and x-rays. CAH is easier to identify in girls as the external genitalia can look ambiguous, though inside everything is female. This may be corrected surgically.
Boys are more difficult to diagnose quickly and died in the past.
The treatment The importance of not forgetting or refusing the steroid tablets I needed to stay alive was drummed into me throughout childhood. I feel ill if I missed taking them so I never stopped, but treatment is a constant balancing act. Taking too much reduces childhood growth, increases your weight and suppresses the immune system. I was quite sickly as a child, forever in and out of hospital. My family thought I wouldn't survive.