I have IGT!!!!
I have never ever been able to EBF any of my babies, but i do BF them as long as possible and then supplement w donor milk.
You CAN BF with IGT... pretty much all IGT ladies that i know cannot EBF. they nurse and then supp.
Now, i have made more milk w each baby, but not a full supply. I had to supp. 26oz w my first, 18oz with my second, and right now we are supping. about 7oz with my third (but needs to increase, so probably more like 10oz). So i have grown a little tissue and making slightly more, but still unable to EBF....this is not uncommon with IGT in the least. But you cant know what you'll make until the time comes. It really comes down to how severe IGT you have (if you have it, there are lot of reasons why milk fails to come in, IGT is one, but there are others like hormonal reasons, etc). But anyways, i have severe IGT, so no, i can't EBF and probably never will, but another IGT mom might not have it AS severe, so she may be able to EBF. It's different for everyone.
if you have any questions, feel free to ask me!
also this is a WONDERFUL support network:
https://www.facebook.com/groups/IGTmamas/