I have 2 SW CAH boys,  8 and 5 years old.  They are both very slim and active,  almost on the skinny side.  My husband is tall and slim, I am short and athletic.  We eat very healthy (most of the time) and stay really active.   Remember lots of kids with and without CAH are heavy these days.  I do believe excess steroids/oversuppression can lead to weight gain so it is something to stay on top of,  my oldest was oversuppressed due to a bad endo, he was puffy but not heavy or fat.  Once his dose was decreased he seemed to slim down quite quickly.

 

Best of luck.