Hi NN,
My son was diagnosed with FTT. We had other issues, as he was a preemie and started out small, but once we were home, he wasn't gaining weight. There were a couple things that were done and today, he is a healthy happy 4 year old. He is also on the thin side, but he's on the taller side of average and he just doesn't have the frame to have a whole lot of weight. I just don't think he will ever be a big kid in terms of weight.
As a social worker I was DEVISTATED to hear that my baby had FTT. I had ONLY heard of it in instances where the parents were not caring for their children. Its NOT a reflection of you. Sometimes their bodies just can't handle the weight gain and need some assistance.
I think nutrition is an excellent way to start. Try high fat foods (good fats). Are you giving her cow's milk? You can switch to whole milk, dip everything in "dip" ranch dressing or some other type of high calorie food. Icecream carnation milk shakes . . .there are all sorts of tips. I can share some other things if you'd like.
You are not alone. Please let me know if you'd like to "chat" or have any other questions.
Hugs,
B.