I had a ERPC (old D&C) when DD was 12 weeks old due to retained placenta.
We couldn't get DD on a bottle, tried everything, didn't happen. So we winged it (not what you want to hear) but hear me out as it ends well 
They wouldn't let her in on the ward at all, as it was day surgery and they said that the risk of infections / germs etc were not a good place for a new born 
, therefore, she came to the carpark at 6.55am and I fed her then, she then went back with my DP and my DM came with me on the ward.
DP had plenty of expressed milk, various bottles and syringes too. She also was a 1-2 hour feeding baby so was holding out because I wasn't there. She took one when DP offered it at 10am (3 hours from last feed) She didn't take the full amount, but enough to keep her going.
I went on the ward and had my op at around 9am and I explicitly spoke to the aneathisist (sp) and told him I was feeding so he didn't "knock" me out too much (if that is possible) he used as little as he could get away with and I requested no painkillers until I came round and could determine how much pain I was in.
I came around within 20 minutes of being put to sleep and stopped on the ward for a further 3 hours (their request) I was ready to sign myself out but they let me go under strict instruction to call if there was a problem. I was home by 2.30pm and DD had taken another 2oz of my milk at 1pm (another 3 hours gap)
I fed her on my return home and then we both slept for a few hours that afternoon in bed together. I got away with co-codomaol and ibruprofen painkillers rather than anything stronger.
[[http://www.breastfeedingnetwork.org.uk/pdfs/General_anaesthetics%20and_Breastfeeding_September_2009.pdf BFN link to factsheet] on BF'ing and GA's - good read; DD was a little sleepy in the afternoon after that first feed, but it suited us and I was better then to be able to look after her (retained placenta being quite serious, I had to have the op!)
Looking back, we could have got away with her coming in the hospital and in to the ward because I had a room on my own (ERPC is normally for women who have retained products from miscarriage so they give the women their own room). Alternatively, she could have been fed in the corridor if they wouldn't let her on the ward.