stefaniehi there! we are currently having the exact same issue. my 5 month old swcah son is 26 inches but a little over 20 lbs. his 17ohps are low, even though he is only on 3.75 mg of cortef. what doses of cortef is your child on and how are the labs???
growth hormone could be an option, but usually not until they are over 2 years of age.
louise