Adrenal Insufficiency - 2 old month new born baby-- help me?

I have a newborn baby (male). he is now 2 month old. Last week back, he has coughed and his skin make brownish and his body is not develop according baby growth chart. I have admitted my baby in wadia, mumbai. Now he is under treatment. Doctor taken two, three times blood for testing. They have doubted "Adrenal Insufficiency", They have told me adrenal gland is not well developed in his body, so he should be taken one table long life. My wife and me very disappointed when listening. Please advise me, would my baby need daily dose long time? Please suggest if anybody know about this