Klou you'll have to tell your vain friend that it's pregnancy that causes 'saggy tits' not breastfeeding! Common misconception though.
I also had a hard time establishing bf with DS1 but I think a lot of that was down to his traumatic birth. We spent the first week in hospital and he was just too sleepy to feed so I was hooked up to an electric double breastpump (nice....), gave him what I expressed then gave him formula top ups using a bottle to get the fluids through him, under the paediatricians orders. By day 5 he suddenly woke up, started breastfeeding brilliantly and didn't have any more formula until 4 months when I introduced one bottle a day!
All that expressing in the early days gave me a huge oversupply of milk and I leaked copiously for months, on the plus side I collected lots of the milk that leaked out and froze it so I had a handy supply when I left DS1 with someone. As he had taken a bottle so early he was never bothered where his milk came from and there was no 'nipple-teat confusion' which I had been so worried about.
DS2 on the other hand was born by ELCS and breastfed beautifully from day 1. No problems and it was a breeze compared to the first time. I expressed and gave him a bit of milk from a bottle at around 3 or 4 weeks, just to check he would, and he did. He hardly ever got left with anyone else at feed times as I hate the way I get engorged and my supply gets messed up when I miss a feed, expressing just doesn't empty the boob so well. Anyway, when he got to about 5 months I suddenly found that he wouldn't take a bottle, aaargh!!!! We had a day out planned when he would be about 7 months , just me and DP, with tickets, couldn't take children, was getting quite worried..... Tried all sorts of different bottles and cups, expressed milk, different formulae, nothing worked. Kept trying once a day for about a month until finally he accepted one, phew! Oddly enough he wouldn't touch SMA, which is what I had occasionally given to DS1 and would only have Cow and Gate, I hadn't even though they might taste different.
Whilst exclusively breastfeeding this next baby I will definitely being making more effort to get him or her used to the occasional bottle, it is so important to me to be able to leave them and know they will take a feed after the stress of DS2's refusal! That said, I love breastfeeding so I'm looking forward to it again, this is likely to be our last baby so I shall make the most of it.
Glad to hear about all the lovely scans, ours is next Thursday (31st). We will be on Team Yellow too 