Traveller, we had a member around here who conceived her twin sons through IVF, went through multiple bfing hassles as they were early and needed a supply line, etc, but did get to a successful bfing relationship with both boys that lasted over two years! They self-weaned, from memory. She isn't really around any more, but I'm sure she won't mind me sharing her story. There's a great blog on the interwebz about a US mum who exclusively bfs her triplet daughters too. So you're right, multiples is not a barrier.