I have just found this thread.
I am also in this position. DS2 18months Is FTT and they are looking into autism and possible Cystic Fibrosis or Cows protein and grass allergies.
We have been referred to a ST and Dietitian.
Waiting on test results for a few things but in the meantime they have us on a dairy free diet and have put his on neocate (sp?)
He was on Pediasure and Fortini which I thought were working fine but the dietitian wasn't happy.
Sorry for the rant I'm at my wits end with this latest change.
I'm still breastfeeding so I have had to cut everything out of my diet also.
Now he wont eat anything.
I hope you are all closer to your diagnosis. The wait is killing me.