My son DS was diagnosed with CMPI and failure to thrive at 8 weeks. Took him over 3 months to put on a kilo in the beginning.
He had a very distended stomach, pale, unwell looking skin and green/black, sludgy, mucous poo at every nappy change.
He was a prem so we took him to get so medication from the children's hospital for a UTI and as soon as the emergency room dr saw him, she put him in hospital straight. He had been tested numerous times whilst in the NICU and nothing was found. Many poos tested, ultrasounds on his stomach, blood tests etc. The paed and gastroenterologist who we were now under put him on Pepti Jnr and got him to stop bf him. His stomach went down within 3 days and we weren't having multiple nappies changes anymore.
He is still below the charts now but looks healthy and is happy.
We have just weaned him from Pepti Jnr (not our choice, no chemist had stock in NSW) and paed said to try Allerpro which he coped with well but again had to wean him due to no stock. We have been waiting 8 weeks now for a order of Pepti Jnr/Allerpro but the chemist has told us it will be in a few days but the chemist have never received the order (like Cue said). He is corrected age of 1 now, so he is been eased on to cows milk very slowly with the advice of the paed.
We still see a paed and gastroenterologist every 3 months. He still is not on the growth charts but all Drs are happy with the way he is growing.
If it is taking so long to get into the Paed, I would ring back and explain your situation. See if they have a cancellation appt or change paed.
Good luck. I hope you find answers.