Growth related. You suggest can do.

Hello Drs My son age is 2.7 right now. We noticed that his height and weight not growing when he was 1.8 years old. We discussed the same with Dr with whom we were taking vaccinations, he suggested that give some multivitamins and some other syrup which we tried But still the body weight and height were same I mean no difference we noticed. Later we consulted with some other Dr who was had suggested some tests which we have made and later we got to know that pituitary gland is released very less growth hormones. After that we started giving those hormones does from outside via injection as per dr suggestion. Now my query is we are getting changes in height of my baby bit that also not much and he is very thin. We are giving him all good food and even nutrition powder as well as suggested by dr. But still not getting much improvement. Pls suggest what I can give which help in growing weight and doesn't affect with injection which we are giving or any test which you suggest can do.