I ended up with my first on formula after 6 weeks. Now I have 8 week old twins and am breastfeeding them. I don't regret for a second either decision, especially when i look at my healthy active toddler. Every baby and experience is different. I can honestly say that as hard as breastfeeding twins is, trying to b/f my firstborn was harder. much harder. So natasha, i think its worth giving it a go the second time around, as your experience could be completely different.
This time, I'd already decided that if it didnt work again, i wouldnt waste a second feeling guilty about it, nor would i try to justify my decision to anyone (like i did the first time). My babies, my business.