Hi,
I had a premmie baby. She was feed via a tube for the 1st 6ish weeks from my expressed milk, as she was too young to suck. After that I breastfeed her but it was quite difficult as she became lazy and knew if she didn't feed off me she would be feed anyway by the tube. To get her started as we tried everything and she wouldn't attach we used a new method called finger feeding, where we attached a feeding tube to my finger and let her suck on it and so then she associate sucking with feeding. It worked straight away and the next feed she was sucking!! This method doesn't work for everyone but it worked wonders for me!!