Hi Benjalamummy and huge congratulations to your friend!
My twins were delivered at 34 + 4 weighing 3lb 14oz and 5lb 1 oz and had a 2 week stay in SCBU.
I wanted to breastfeed, so expressed for the all the time that they were in hospital, (including setting an alarm for 2am so that could express during what is meant to be the best time for milk production (2 to 4am, can't remember why, though!)). The boys were topped up with formula. We put them to the breast from the start and once they started to latch on, they were tube fed while sucking, to get them to associate being fed with suckling.
They were demand fed once we left hospital and although there were times when I fed them both together, on an EZ2nurse type pillow, I mostly fed them one at a time - my reasoning being that they might be twins, but they are also two separate people and I didn't feel I should force waking and feeding on the one who was sleeping. Also I felt that this was a time for each boy to have a bit of one to one time with me, as everything else is and will be shared.
It was relentless at the beginning, I can't think of any other word to describe it! There were days when it felt like all I did was feed babies. Often I would just get one settled after a feed and just get myself lying down for a nap, and the other would wake up. There were also nights when it was constant feeding and they nearly broke me - I started a thread about it at the time!! And I had a major wobble when they were 5 weeks old and just felt that I couldn't go on with it. But I pushed on through and they were almost ebf for the first 6 months. (My DH would give each a bottle of formula in the evening because it gave me an hour off baby feeding, and that helped me to keep going).
They are now nearly 2 and I still feed them if they wake in the night as it's still the quickest way for us all to get back to sleep. I never intended to keep going this long, but there you are!