My 12yo takes Advair, albeit sporadically and I always thought there was less of an impact on growth for the inhaled steroids than the systemic ones. But then again, I'm not a doctor. Turns out my son had short stature (3rd-5th percentile) due to a chronic digestive disease, and had to take oral prednisone for several months, but now that his disease is under control, he's starting to grow again.
If your children's heights still seem to have stalled after monitoring them for a few months, you might want to ask for an endocrinology consult to see if they are deficient in growth hormone, and also to assess their bone age and density. It's my understanding that the endocrinologist can be really helpful in assessing and addressing growth issues.
12yo son w/Crohn's, dx'd 5/06, currently in remission; also ADHD and mild asthma
Imuran 50mg/75mg am/pm; Daytrana patch 35mg; Fisol, Viactive chews, children's multi
Resection planned in 6/07 to remove fibrotic stricture in TI
10yo son ADHD & ?, Daytrana patch 40mg, Abilify 20mg